diff --git a/packages/localize/src/tools/src/extract/source_files/es5_extract_plugin.ts b/packages/localize/src/tools/src/extract/source_files/es5_extract_plugin.ts
index 27ae97333a..41b8f53fc1 100644
--- a/packages/localize/src/tools/src/extract/source_files/es5_extract_plugin.ts
+++ b/packages/localize/src/tools/src/extract/source_files/es5_extract_plugin.ts
@@ -35,7 +35,7 @@ export function makeEs5ExtractPlugin(
             // If we get a BabelParseError here then something went wrong with Babel itself
             // since there must be something wrong with the structure of the AST generated
             // by Babel parsing a TaggedTemplateExpression.
-            throw buildCodeFrameError(callPath, e);
+            throw buildCodeFrameError(fs, callPath, e);
           } else {
             throw e;
           }
diff --git a/packages/localize/src/tools/src/source_file_utils.ts b/packages/localize/src/tools/src/source_file_utils.ts
index 55cd10c5fa..4d22565987 100644
--- a/packages/localize/src/tools/src/source_file_utils.ts
+++ b/packages/localize/src/tools/src/source_file_utils.ts
@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {AbsoluteFsPath, getFileSystem, PathManipulation} from '@angular/compiler-cli/src/ngtsc/file_system';
+import {absoluteFrom, AbsoluteFsPath, getFileSystem, PathManipulation} from '@angular/compiler-cli/src/ngtsc/file_system';
 import {ɵisMissingTranslationError, ɵmakeTemplateObject, ɵParsedTranslation, ɵSourceLocation, ɵtranslate} from '@angular/localize';
 import {NodePath} from '@babel/traverse';
 import * as t from '@babel/types';
@@ -400,8 +400,19 @@ export function isBabelParseError(e: any): e is BabelParseError {
   return e.type === 'BabelParseError';
 }
 
-export function buildCodeFrameError(path: NodePath, e: BabelParseError): string {
-  const filename = path.hub.file.opts.filename || '(unknown file)';
+export function buildCodeFrameError(
+    fs: PathManipulation, path: NodePath, e: BabelParseError): string {
+  let filename = path.hub.file.opts.filename;
+  if (filename) {
+    filename = fs.resolve(filename);
+    let cwd = path.hub.file.opts.cwd;
+    if (cwd) {
+      cwd = fs.resolve(cwd);
+      filename = fs.relative(cwd, filename);
+    }
+  } else {
+    filename = '(unknown file)';
+  }
   const message = path.hub.file.buildCodeFrameError(e.node, e.message).message;
   return `${filename}: ${message}`;
 }
@@ -434,9 +445,14 @@ export function serializeLocationPosition(location: ɵSourceLocation): string {
 
 function getFileFromPath(fs: PathManipulation, path: NodePath|undefined): AbsoluteFsPath|null {
   const opts = path?.hub.file.opts;
-  return opts?.filename ?
-      fs.resolve(opts.generatorOpts.sourceRoot ?? opts.cwd, fs.relative(opts.cwd, opts.filename)) :
-      null;
+  const filename = opts?.filename;
+  if (!filename) {
+    return null;
+  }
+  const relativePath = fs.relative(opts.cwd, filename);
+  const root = opts.generatorOpts.sourceRoot ?? opts.cwd;
+  const absPath = fs.resolve(root, relativePath);
+  return absPath;
 }
 
 function getLineAndColumn(loc: {line: number, column: number}): {line: number, column: number} {
diff --git a/packages/localize/src/tools/src/translate/main.ts b/packages/localize/src/tools/src/translate/main.ts
index b993a0c3db..f0ef79e12b 100644
--- a/packages/localize/src/tools/src/translate/main.ts
+++ b/packages/localize/src/tools/src/translate/main.ts
@@ -105,7 +105,7 @@ if (require.main === module) {
   const sourceRootPath = options.r;
   const sourceFilePaths = glob.sync(options.s, {cwd: sourceRootPath, nodir: true});
   const translationFilePaths: (string|string[])[] = convertArraysFromArgs(options.t);
-  const outputPathFn = getOutputPathFn(fs.resolve(options.o));
+  const outputPathFn = getOutputPathFn(fs, fs.resolve(options.o));
   const diagnostics = new Diagnostics();
   const missingTranslation = options.m as DiagnosticHandlingStrategy;
   const duplicateTranslation = options.d as DiagnosticHandlingStrategy;
diff --git a/packages/localize/src/tools/src/translate/output_path.ts b/packages/localize/src/tools/src/translate/output_path.ts
index cfa3c8e609..2285794bdb 100644
--- a/packages/localize/src/tools/src/translate/output_path.ts
+++ b/packages/localize/src/tools/src/translate/output_path.ts
@@ -5,8 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {AbsoluteFsPath} from '@angular/compiler-cli/src/ngtsc/file_system';
-import {join} from 'path';
+import {AbsoluteFsPath, PathManipulation} from '@angular/compiler-cli/src/ngtsc/file_system';
 
 /**
  * A function that will return an absolute path to where a file is to be written, given a locale and
@@ -23,8 +22,8 @@ export interface OutputPathFn {
  * The special `{{LOCALE}}` marker will be replaced with the locale code of the current translation.
  * @param outputFolder An absolute path to the folder containing this set of translations.
  */
-export function getOutputPathFn(outputFolder: AbsoluteFsPath): OutputPathFn {
+export function getOutputPathFn(fs: PathManipulation, outputFolder: AbsoluteFsPath): OutputPathFn {
   const [pre, post] = outputFolder.split('{{LOCALE}}');
-  return post === undefined ? (_locale, relativePath) => join(pre, relativePath) :
-                              (locale, relativePath) => join(pre + locale + post, relativePath);
+  return post === undefined ? (_locale, relativePath) => fs.join(pre, relativePath) :
+                              (locale, relativePath) => fs.join(pre + locale + post, relativePath);
 }
diff --git a/packages/localize/src/tools/src/translate/source_files/es2015_translate_plugin.ts b/packages/localize/src/tools/src/translate/source_files/es2015_translate_plugin.ts
index be1f351361..a3aa49ea60 100644
--- a/packages/localize/src/tools/src/translate/source_files/es2015_translate_plugin.ts
+++ b/packages/localize/src/tools/src/translate/source_files/es2015_translate_plugin.ts
@@ -41,7 +41,7 @@ export function makeEs2015TranslatePlugin(
             // If we get a BabelParseError here then something went wrong with Babel itself
             // since there must be something wrong with the structure of the AST generated
             // by Babel parsing a TaggedTemplateExpression.
-            throw buildCodeFrameError(path, e);
+            throw buildCodeFrameError(fs, path, e);
           } else {
             throw e;
           }
diff --git a/packages/localize/src/tools/src/translate/source_files/es5_translate_plugin.ts b/packages/localize/src/tools/src/translate/source_files/es5_translate_plugin.ts
index 6a98ff8729..b8f1bf4c65 100644
--- a/packages/localize/src/tools/src/translate/source_files/es5_translate_plugin.ts
+++ b/packages/localize/src/tools/src/translate/source_files/es5_translate_plugin.ts
@@ -37,7 +37,7 @@ export function makeEs5TranslatePlugin(
           }
         } catch (e) {
           if (isBabelParseError(e)) {
-            diagnostics.error(buildCodeFrameError(callPath, e));
+            diagnostics.error(buildCodeFrameError(fs, callPath, e));
           } else {
             throw e;
           }
diff --git a/packages/localize/src/tools/src/translate/source_files/source_file_translation_handler.ts b/packages/localize/src/tools/src/translate/source_files/source_file_translation_handler.ts
index c3d69b4206..8c71aed038 100644
--- a/packages/localize/src/tools/src/translate/source_files/source_file_translation_handler.ts
+++ b/packages/localize/src/tools/src/translate/source_files/source_file_translation_handler.ts
@@ -81,6 +81,7 @@ export class SourceFileTranslationHandler implements TranslationHandler {
         makeEs2015TranslatePlugin(diagnostics, translationBundle.translations, options, this.fs),
         makeEs5TranslatePlugin(diagnostics, translationBundle.translations, options, this.fs),
       ],
+      cwd: sourceRoot,
       filename,
     });
     if (translated && translated.code) {
diff --git a/packages/localize/src/tools/test/BUILD.bazel b/packages/localize/src/tools/test/BUILD.bazel
index 705826ea14..1e2d6d768c 100644
--- a/packages/localize/src/tools/test/BUILD.bazel
+++ b/packages/localize/src/tools/test/BUILD.bazel
@@ -15,6 +15,7 @@ ts_library(
         "//packages/compiler-cli/src/ngtsc/logging/testing",
         "//packages/localize",
         "//packages/localize/src/tools",
+        "//packages/localize/src/tools/test/helpers",
         "//packages/localize/src/utils",
         "@npm//@babel/core",
         "@npm//@babel/generator",
diff --git a/packages/localize/src/tools/test/extract/extractor_spec.ts b/packages/localize/src/tools/test/extract/extractor_spec.ts
index 48d380915c..d2dfa90305 100644
--- a/packages/localize/src/tools/test/extract/extractor_spec.ts
+++ b/packages/localize/src/tools/test/extract/extractor_spec.ts
@@ -5,13 +5,13 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {absoluteFrom, getFileSystem, relativeFrom} from '@angular/compiler-cli/src/ngtsc/file_system';
-import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
+import {absoluteFrom, getFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system';
 import {MockLogger} from '@angular/compiler-cli/src/ngtsc/logging/testing';
 
 import {MessageExtractor} from '../../src/extract/extraction';
+import {runInNativeFileSystem} from '../helpers';
 
-runInEachFileSystem(() => {
+runInNativeFileSystem(() => {
   describe('extractMessages', () => {
     it('should extract a message for each $localize template tag', () => {
       const fs = getFileSystem();
@@ -20,7 +20,7 @@ runInEachFileSystem(() => {
       const filename = 'relative/path.js';
       const file = fs.resolve(basePath, filename);
       const extractor = new MessageExtractor(fs, logger, {basePath});
-      fs.ensureDir(absoluteFrom('/root/path/relative'));
+      fs.ensureDir(fs.dirname(file));
       fs.writeFile(file, [
         '$localize`:meaning|description:a${1}b${2}c`;',
         '$localize(__makeTemplateObject(["a", ":custom-placeholder:b", "c"], ["a", ":custom-placeholder:b", "c"]), 1, 2);',
@@ -40,19 +40,19 @@ runInEachFileSystem(() => {
           {
             start: {line: 0, column: 10},
             end: {line: 0, column: 32},
-            file: absoluteFrom('/root/path/relative/path.js'),
+            file,
             text: ':meaning|description:a',
           },
           {
             start: {line: 0, column: 36},
             end: {line: 0, column: 37},
-            file: absoluteFrom('/root/path/relative/path.js'),
+            file,
             text: 'b',
           },
           {
             start: {line: 0, column: 41},
             end: {line: 0, column: 42},
-            file: absoluteFrom('/root/path/relative/path.js'),
+            file,
             text: 'c',
           }
         ],
@@ -60,18 +60,8 @@ runInEachFileSystem(() => {
         placeholderNames: ['PH', 'PH_1'],
         substitutions: jasmine.any(Object),
         substitutionLocations: {
-          PH: {
-            start: {line: 0, column: 34},
-            end: {line: 0, column: 35},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: '1'
-          },
-          PH_1: {
-            start: {line: 0, column: 39},
-            end: {line: 0, column: 40},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: '2'
-          }
+          PH: {start: {line: 0, column: 34}, end: {line: 0, column: 35}, file, text: '1'},
+          PH_1: {start: {line: 0, column: 39}, end: {line: 0, column: 40}, file, text: '2'}
         },
         legacyIds: [],
         location: {
@@ -92,19 +82,19 @@ runInEachFileSystem(() => {
           {
             start: {line: 1, column: 69},
             end: {line: 1, column: 72},
-            file: absoluteFrom('/root/path/relative/path.js'),
+            file,
             text: '"a"',
           },
           {
             start: {line: 1, column: 74},
             end: {line: 1, column: 97},
-            file: absoluteFrom('/root/path/relative/path.js'),
+            file,
             text: '":custom-placeholder:b"',
           },
           {
             start: {line: 1, column: 99},
             end: {line: 1, column: 102},
-            file: absoluteFrom('/root/path/relative/path.js'),
+            file,
             text: '"c"',
           }
         ],
@@ -112,18 +102,9 @@ runInEachFileSystem(() => {
         placeholderNames: ['custom-placeholder', 'PH_1'],
         substitutions: jasmine.any(Object),
         substitutionLocations: {
-          'custom-placeholder': {
-            start: {line: 1, column: 106},
-            end: {line: 1, column: 107},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: '1'
-          },
-          PH_1: {
-            start: {line: 1, column: 109},
-            end: {line: 1, column: 110},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: '2'
-          }
+          'custom-placeholder':
+              {start: {line: 1, column: 106}, end: {line: 1, column: 107}, file, text: '1'},
+          PH_1: {start: {line: 1, column: 109}, end: {line: 1, column: 110}, file, text: '2'}
         },
         legacyIds: [],
         location: {
@@ -145,38 +126,13 @@ runInEachFileSystem(() => {
         placeholderNames: ['PH', 'PH_1'],
         substitutions: jasmine.any(Object),
         substitutionLocations: {
-          PH: {
-            start: {line: 2, column: 26},
-            end: {line: 2, column: 27},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: '1'
-          },
-          PH_1: {
-            start: {line: 2, column: 31},
-            end: {line: 2, column: 32},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: '2'
-          }
+          PH: {start: {line: 2, column: 26}, end: {line: 2, column: 27}, file, text: '1'},
+          PH_1: {start: {line: 2, column: 31}, end: {line: 2, column: 32}, file, text: '2'}
         },
         messagePartLocations: [
-          {
-            start: {line: 2, column: 10},
-            end: {line: 2, column: 24},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: ':@@custom-id:a'
-          },
-          {
-            start: {line: 2, column: 28},
-            end: {line: 2, column: 29},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: 'b'
-          },
-          {
-            start: {line: 2, column: 33},
-            end: {line: 2, column: 34},
-            file: absoluteFrom('/root/path/relative/path.js'),
-            text: 'c'
-          }
+          {start: {line: 2, column: 10}, end: {line: 2, column: 24}, file, text: ':@@custom-id:a'},
+          {start: {line: 2, column: 28}, end: {line: 2, column: 29}, file, text: 'b'},
+          {start: {line: 2, column: 33}, end: {line: 2, column: 34}, file, text: 'c'}
         ],
         legacyIds: [],
         location: {
diff --git a/packages/localize/src/tools/test/extract/integration/BUILD.bazel b/packages/localize/src/tools/test/extract/integration/BUILD.bazel
index 7bbc57a8a8..0fbc08c302 100644
--- a/packages/localize/src/tools/test/extract/integration/BUILD.bazel
+++ b/packages/localize/src/tools/test/extract/integration/BUILD.bazel
@@ -15,6 +15,7 @@ ts_library(
         "//packages/compiler-cli/src/ngtsc/testing",
         "//packages/localize/src/tools",
         "//packages/localize/src/tools/test:test_lib",
+        "//packages/localize/src/tools/test/helpers",
     ],
 )
 
diff --git a/packages/localize/src/tools/test/extract/integration/main_spec.ts b/packages/localize/src/tools/test/extract/integration/main_spec.ts
index fca98d89a7..982ee27210 100644
--- a/packages/localize/src/tools/test/extract/integration/main_spec.ts
+++ b/packages/localize/src/tools/test/extract/integration/main_spec.ts
@@ -7,15 +7,15 @@
  */
 import {absoluteFrom, AbsoluteFsPath, FileSystem, getFileSystem, setFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system';
 import {InvalidFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/src/invalid_file_system';
-import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
 import {MockLogger} from '@angular/compiler-cli/src/ngtsc/logging/testing';
 import {loadTestDirectory} from '@angular/compiler-cli/src/ngtsc/testing';
 
 import {extractTranslations} from '../../../src/extract/main';
 import {FormatOptions} from '../../../src/extract/translation_files/format_options';
+import {runInNativeFileSystem} from '../../helpers';
 import {toAttributes} from '../translation_files/utils';
 
-runInEachFileSystem(() => {
+runInNativeFileSystem(() => {
   let fs: FileSystem;
   let logger: MockLogger;
   let rootPath: AbsoluteFsPath;
diff --git a/packages/localize/src/tools/test/extract/integration/test_files/BUILD.bazel b/packages/localize/src/tools/test/extract/integration/test_files/BUILD.bazel
index 3abde62d10..a56e44bec8 100644
--- a/packages/localize/src/tools/test/extract/integration/test_files/BUILD.bazel
+++ b/packages/localize/src/tools/test/extract/integration/test_files/BUILD.bazel
@@ -1,6 +1,7 @@
 package(default_visibility = ["//packages/localize/src/tools/test/extract/integration:__pkg__"])
 
 load("@npm//typescript:index.bzl", "tsc")
+load("@build_bazel_rules_nodejs//:index.bzl", "copy_to_bin")
 
 tsc(
     name = "compile_es5",
@@ -44,7 +45,8 @@ tsc(
     data = glob(["src/*.ts"]),
 )
 
-filegroup(
+# Use copy_to_bin since filegroup doesn't seem to work on Windows.
+copy_to_bin(
     name = "test_files",
     srcs = glob([
         "**/*.js",
diff --git a/packages/localize/src/tools/test/extract/source_files/es5_extract_plugin_spec.ts b/packages/localize/src/tools/test/extract/source_files/es5_extract_plugin_spec.ts
index db587f0413..a1eb1b4b68 100644
--- a/packages/localize/src/tools/test/extract/source_files/es5_extract_plugin_spec.ts
+++ b/packages/localize/src/tools/test/extract/source_files/es5_extract_plugin_spec.ts
@@ -6,30 +6,42 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {getFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system';
-import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
+import {FileSystem, getFileSystem, PathSegment, relativeFrom} from '@angular/compiler-cli/src/ngtsc/file_system';
 import {ɵParsedMessage} from '@angular/localize/private';
 import {transformSync} from '@babel/core';
 
 import {makeEs5ExtractPlugin} from '../../../src/extract/source_files/es5_extract_plugin';
+import {runInNativeFileSystem} from '../../helpers';
+
+runInNativeFileSystem(() => {
+  let fs: FileSystem;
+  let testPath: PathSegment;
+
+  beforeEach(() => {
+    fs = getFileSystem();
+    testPath = relativeFrom('app/dist/test.js');
+  });
 
-runInEachFileSystem(() => {
   describe('makeEs5ExtractPlugin()', () => {
     it('should error with code-frame information if the first argument to `$localize` is not an array',
        () => {
          const input = '$localize(null, [])';
          expect(() => transformCode(input))
              .toThrowError(
-                 'Cannot create property \'message\' on string \'/app/dist/test.js: Unexpected messageParts for `$localize` (expected an array of strings).\n' +
+                 `Cannot create property 'message' on string '${testPath}: ` +
+                 'Unexpected messageParts for `$localize` (expected an array of strings).\n' +
                  '> 1 | $localize(null, [])\n' +
                  '    |           ^^^^\'');
        });
 
     function transformCode(input: string): ɵParsedMessage[] {
       const messages: ɵParsedMessage[] = [];
+      const cwd = fs.resolve('/');
+      const filename = fs.resolve(cwd, testPath);
       transformSync(input, {
         plugins: [makeEs5ExtractPlugin(getFileSystem(), messages)],
-        filename: '/app/dist/test.js'
+        filename,
+        cwd,
       })!.code!;
       return messages;
     }
diff --git a/packages/localize/src/tools/test/helpers/BUILD.bazel b/packages/localize/src/tools/test/helpers/BUILD.bazel
new file mode 100644
index 0000000000..a54218c740
--- /dev/null
+++ b/packages/localize/src/tools/test/helpers/BUILD.bazel
@@ -0,0 +1,14 @@
+load("//tools:defaults.bzl", "ts_library")
+
+ts_library(
+    name = "helpers",
+    testonly = True,
+    srcs = glob(
+        ["**/*.ts"],
+    ),
+    visibility = ["//packages/localize/src/tools/test:__subpackages__"],
+    deps = [
+        "//packages/compiler-cli/src/ngtsc/file_system",
+        "//packages/compiler-cli/src/ngtsc/file_system/testing",
+    ],
+)
diff --git a/packages/localize/src/tools/test/helpers/index.ts b/packages/localize/src/tools/test/helpers/index.ts
new file mode 100644
index 0000000000..9911cdd2b3
--- /dev/null
+++ b/packages/localize/src/tools/test/helpers/index.ts
@@ -0,0 +1,25 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {setFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system';
+import {InvalidFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/src/invalid_file_system';
+import {MockFileSystemNative} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
+
+/**
+ * Only run these tests on the "native" file-system.
+ *
+ * Babel uses the `path.resolve()` function internally, which makes it very hard to mock out the
+ * file-system from the outside. We run these tests on Unix and Windows in our CI jobs, so there is
+ * test coverage.
+ */
+export function runInNativeFileSystem(callback: () => void) {
+  describe(`<<FileSystem: Native>>`, () => {
+    beforeEach(() => setFileSystem(new MockFileSystemNative()));
+    afterEach(() => setFileSystem(new InvalidFileSystem()));
+    callback();
+  });
+}
diff --git a/packages/localize/src/tools/test/source_file_utils_spec.ts b/packages/localize/src/tools/test/source_file_utils_spec.ts
index 249c4beef8..4f36d9d9e7 100644
--- a/packages/localize/src/tools/test/source_file_utils_spec.ts
+++ b/packages/localize/src/tools/test/source_file_utils_spec.ts
@@ -6,16 +6,16 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {absoluteFrom, getFileSystem, PathManipulation} from '@angular/compiler-cli/src/ngtsc/file_system';
-import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
 import {ɵmakeTemplateObject} from '@angular/localize';
 import {NodePath, TransformOptions, transformSync} from '@babel/core';
 import generate from '@babel/generator';
-
 import template from '@babel/template';
 import {Expression, Identifier, TaggedTemplateExpression, ExpressionStatement, CallExpression, isParenthesizedExpression, numericLiteral, binaryExpression, NumericLiteral} from '@babel/types';
-import {isGlobalIdentifier, isNamedIdentifier, isStringLiteralArray, isArrayOfExpressions, unwrapStringLiteralArray, unwrapMessagePartsFromLocalizeCall, wrapInParensIfNecessary, buildLocalizeReplacement, unwrapSubstitutionsFromLocalizeCall, unwrapMessagePartsFromTemplateLiteral, getLocation} from '../src/source_file_utils';
 
-runInEachFileSystem(() => {
+import {isGlobalIdentifier, isNamedIdentifier, isStringLiteralArray, isArrayOfExpressions, unwrapStringLiteralArray, unwrapMessagePartsFromLocalizeCall, wrapInParensIfNecessary, buildLocalizeReplacement, unwrapSubstitutionsFromLocalizeCall, unwrapMessagePartsFromTemplateLiteral, getLocation} from '../src/source_file_utils';
+import {runInNativeFileSystem} from './helpers';
+
+runInNativeFileSystem(() => {
   let fs: PathManipulation;
   beforeEach(() => fs = getFileSystem());
   describe('utils', () => {
@@ -414,7 +414,7 @@ runInEachFileSystem(() => {
       it('should return a plain object containing the start, end and file of a NodePath', () => {
         const taggedTemplate = getTaggedTemplate('const x = $localize `message`;', {
           filename: 'src/test.js',
-          sourceRoot: '/root',
+          sourceRoot: fs.resolve('/project'),
         });
         const location = getLocation(fs, taggedTemplate)!;
         expect(location).toBeDefined();
@@ -422,12 +422,12 @@ runInEachFileSystem(() => {
         expect(location.start.constructor.name).toEqual('Object');
         expect(location.end).toEqual({line: 0, column: 29});
         expect(location.end?.constructor.name).toEqual('Object');
-        expect(location.file).toEqual(absoluteFrom('/root/src/test.js'));
+        expect(location.file).toEqual(fs.resolve('/project/src/test.js'));
       });
 
       it('should return `undefined` if the NodePath has no filename', () => {
         const taggedTemplate = getTaggedTemplate(
-            'const x = $localize ``;', {sourceRoot: '/root', filename: undefined});
+            'const x = $localize ``;', {sourceRoot: fs.resolve('/project'), filename: undefined});
         const location = getLocation(fs, taggedTemplate);
         expect(location).toBeUndefined();
       });
@@ -451,7 +451,8 @@ function getExpressions<T extends Expression>(
   const expressions: NodePath<Expression>[] = [];
   transformSync(code, {
     code: false,
-    filename: '/test/file.js',
+    filename: 'test/file.js',
+    cwd: '/',
     plugins: [{
       visitor: {
         Expression: (path: NodePath<Expression>) => {
@@ -468,7 +469,8 @@ function getLocalizeCall(code: string): NodePath<CallExpression> {
   let callPaths: NodePath<CallExpression>[] = [];
   transformSync(code, {
     code: false,
-    filename: '/test/file.js',
+    filename: 'test/file.js',
+    cwd: '/',
     plugins: [{
       visitor: {
         CallExpression(path) {
diff --git a/packages/localize/src/tools/test/translate/asset_files/asset_file_translation_handler_spec.ts b/packages/localize/src/tools/test/translate/asset_files/asset_file_translation_handler_spec.ts
index fa7fc32429..548e43dbf4 100644
--- a/packages/localize/src/tools/test/translate/asset_files/asset_file_translation_handler_spec.ts
+++ b/packages/localize/src/tools/test/translate/asset_files/asset_file_translation_handler_spec.ts
@@ -23,7 +23,7 @@ runInEachFileSystem(() => {
 
     beforeEach(() => {
       fs = getFileSystem();
-      rootPath = absoluteFrom('/root/path');
+      rootPath = absoluteFrom('/src/path');
       filePath = relativeFrom('relative/path');
       enTranslationPath = absoluteFrom('/translations/en/relative/path');
       enUSTranslationPath = absoluteFrom('/translations/en-US/relative/path');
diff --git a/packages/localize/src/tools/test/translate/integration/BUILD.bazel b/packages/localize/src/tools/test/translate/integration/BUILD.bazel
index ec88d4f317..f2fd7a622f 100644
--- a/packages/localize/src/tools/test/translate/integration/BUILD.bazel
+++ b/packages/localize/src/tools/test/translate/integration/BUILD.bazel
@@ -12,18 +12,17 @@ ts_library(
         "//packages/compiler-cli/src/ngtsc/file_system/testing",
         "//packages/compiler-cli/src/ngtsc/testing",
         "//packages/localize/src/tools",
+        "//packages/localize/src/tools/test/helpers",
     ],
 )
 
 jasmine_node_test(
     name = "integration",
     bootstrap = ["//tools/testing:node_no_angular_es5"],
-    data = glob(
-        [
-            "locales/**",
-            "test_files/**",
-        ],
-    ),
+    data = [
+        "//packages/localize/src/tools/test/translate/integration/locales",
+        "//packages/localize/src/tools/test/translate/integration/test_files",
+    ],
     deps = [
         ":test_lib",
         "@npm//glob",
diff --git a/packages/localize/src/tools/test/translate/integration/locales/BUILD.bazel b/packages/localize/src/tools/test/translate/integration/locales/BUILD.bazel
new file mode 100644
index 0000000000..2a192a90ad
--- /dev/null
+++ b/packages/localize/src/tools/test/translate/integration/locales/BUILD.bazel
@@ -0,0 +1,13 @@
+package(default_visibility = ["//packages/localize/src/tools/test/translate/integration:__pkg__"])
+
+load("@build_bazel_rules_nodejs//:index.bzl", "copy_to_bin")
+
+# Use copy_to_bin since filegroup doesn't seem to work on Windows.
+copy_to_bin(
+    name = "locales",
+    srcs = glob([
+        "**/*.json",
+        "**/*.xlf",
+        "**/*.xtb",
+    ]),
+)
diff --git a/packages/localize/src/tools/test/translate/integration/main_spec.ts b/packages/localize/src/tools/test/translate/integration/main_spec.ts
index fd8eb2ea9d..d091283820 100644
--- a/packages/localize/src/tools/test/translate/integration/main_spec.ts
+++ b/packages/localize/src/tools/test/translate/integration/main_spec.ts
@@ -6,15 +6,15 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {absoluteFrom, AbsoluteFsPath, FileSystem, getFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system';
-import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
 import {loadTestDirectory} from '@angular/compiler-cli/src/ngtsc/testing';
 import {resolve as realResolve} from 'path';
 
 import {Diagnostics} from '../../../src/diagnostics';
 import {translateFiles} from '../../../src/translate/main';
 import {getOutputPathFn} from '../../../src/translate/output_path';
+import {runInNativeFileSystem} from '../../helpers';
 
-runInEachFileSystem(() => {
+runInNativeFileSystem(() => {
   describe('translateFiles()', () => {
     let fs: FileSystem;
     let testDir: AbsoluteFsPath;
@@ -33,7 +33,7 @@ runInEachFileSystem(() => {
 
     it('should copy non-code files to the destination folders', () => {
       const diagnostics = new Diagnostics();
-      const outputPathFn = getOutputPathFn(fs.resolve(testDir, '{{LOCALE}}'));
+      const outputPathFn = getOutputPathFn(fs, fs.resolve(testDir, '{{LOCALE}}'));
       translateFiles({
         sourceRootPath: testFilesDir,
         sourceFilePaths: ['test-1.txt', 'test-2.txt'],
@@ -69,7 +69,7 @@ runInEachFileSystem(() => {
 
     it('should translate and copy source-code files to the destination folders', () => {
       const diagnostics = new Diagnostics();
-      const outputPathFn = getOutputPathFn(fs.resolve(testDir, '{{LOCALE}}'));
+      const outputPathFn = getOutputPathFn(fs, fs.resolve(testDir, '{{LOCALE}}'));
       translateFiles({
         sourceRootPath: testFilesDir,
         sourceFilePaths: ['test.js'],
@@ -97,7 +97,7 @@ runInEachFileSystem(() => {
 
     it('should translate and copy source-code files overriding the locales', () => {
       const diagnostics = new Diagnostics();
-      const outputPathFn = getOutputPathFn(fs.resolve(testDir, '{{LOCALE}}'));
+      const outputPathFn = getOutputPathFn(fs, fs.resolve(testDir, '{{LOCALE}}'));
       translateFiles({
         sourceRootPath: testFilesDir,
         sourceFilePaths: ['test.js'],
@@ -131,7 +131,7 @@ runInEachFileSystem(() => {
 
     it('should merge translation files, if more than one provided, and translate source-code', () => {
       const diagnostics = new Diagnostics();
-      const outputPathFn = getOutputPathFn(fs.resolve(testDir, '{{LOCALE}}'));
+      const outputPathFn = getOutputPathFn(fs, fs.resolve(testDir, '{{LOCALE}}'));
       translateFiles({
         sourceRootPath: testFilesDir,
         sourceFilePaths: ['test-extra.js'],
@@ -165,7 +165,7 @@ runInEachFileSystem(() => {
 
     it('should transform and/or copy files to the destination folders', () => {
       const diagnostics = new Diagnostics();
-      const outputPathFn = getOutputPathFn(fs.resolve(testDir, '{{LOCALE}}'));
+      const outputPathFn = getOutputPathFn(fs, fs.resolve(testDir, '{{LOCALE}}'));
       translateFiles({
         sourceRootPath: testFilesDir,
         sourceFilePaths: ['test-1.txt', 'test-2.txt', 'test.js'],
diff --git a/packages/localize/src/tools/test/translate/integration/test_files/BUILD.bazel b/packages/localize/src/tools/test/translate/integration/test_files/BUILD.bazel
new file mode 100644
index 0000000000..9e8dfcfa8f
--- /dev/null
+++ b/packages/localize/src/tools/test/translate/integration/test_files/BUILD.bazel
@@ -0,0 +1,12 @@
+package(default_visibility = ["//packages/localize/src/tools/test/translate/integration:__pkg__"])
+
+load("@build_bazel_rules_nodejs//:index.bzl", "copy_to_bin")
+
+# Use copy_to_bin since filegroup doesn't seem to work on Windows.
+copy_to_bin(
+    name = "test_files",
+    srcs = glob([
+        "**/*.js",
+        "**/*.txt",
+    ]),
+)
diff --git a/packages/localize/src/tools/test/translate/output_path_spec.ts b/packages/localize/src/tools/test/translate/output_path_spec.ts
index 37f0024db7..377a5009b0 100644
--- a/packages/localize/src/tools/test/translate/output_path_spec.ts
+++ b/packages/localize/src/tools/test/translate/output_path_spec.ts
@@ -5,36 +5,39 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {absoluteFrom} from '@angular/compiler-cli/src/ngtsc/file_system';
+import {absoluteFrom, getFileSystem, PathManipulation} from '@angular/compiler-cli/src/ngtsc/file_system';
 import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
 
 import {getOutputPathFn} from '../../src/translate/output_path';
 
 runInEachFileSystem(() => {
+  let fs: PathManipulation;
+  beforeEach(() => fs = getFileSystem());
+
   describe('getOutputPathFn()', () => {
     it('should return a function that joins the `outputPath` and the `relativePath`', () => {
-      const fn = getOutputPathFn(absoluteFrom('/output/path'));
+      const fn = getOutputPathFn(fs, absoluteFrom('/output/path'));
       expect(fn('en', 'relative/path')).toEqual(absoluteFrom('/output/path/relative/path'));
       expect(fn('en', '../parent/path')).toEqual(absoluteFrom('/output/parent/path'));
     });
 
     it('should return a function that interpolates the `{{LOCALE}}` in the middle of the `outputPath`',
        () => {
-         const fn = getOutputPathFn(absoluteFrom('/output/{{LOCALE}}/path'));
+         const fn = getOutputPathFn(fs, absoluteFrom('/output/{{LOCALE}}/path'));
          expect(fn('en', 'relative/path')).toEqual(absoluteFrom('/output/en/path/relative/path'));
          expect(fn('fr', 'relative/path')).toEqual(absoluteFrom('/output/fr/path/relative/path'));
        });
 
     it('should return a function that interpolates the `{{LOCALE}}` in the middle of a path segment in the `outputPath`',
        () => {
-         const fn = getOutputPathFn(absoluteFrom('/output-{{LOCALE}}-path'));
+         const fn = getOutputPathFn(fs, absoluteFrom('/output-{{LOCALE}}-path'));
          expect(fn('en', 'relative/path')).toEqual(absoluteFrom('/output-en-path/relative/path'));
          expect(fn('fr', 'relative/path')).toEqual(absoluteFrom('/output-fr-path/relative/path'));
        });
 
     it('should return a function that interpolates the `{{LOCALE}}` at the end of the `outputPath`',
        () => {
-         const fn = getOutputPathFn(absoluteFrom('/output/{{LOCALE}}'));
+         const fn = getOutputPathFn(fs, absoluteFrom('/output/{{LOCALE}}'));
          expect(fn('en', 'relative/path')).toEqual(absoluteFrom('/output/en/relative/path'));
          expect(fn('fr', 'relative/path')).toEqual(absoluteFrom('/output/fr/relative/path'));
        });
diff --git a/packages/localize/src/tools/test/translate/source_files/es2015_translate_plugin_spec.ts b/packages/localize/src/tools/test/translate/source_files/es2015_translate_plugin_spec.ts
index b224924511..3e3b5300db 100644
--- a/packages/localize/src/tools/test/translate/source_files/es2015_translate_plugin_spec.ts
+++ b/packages/localize/src/tools/test/translate/source_files/es2015_translate_plugin_spec.ts
@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
+import {FileSystem, getFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system';
 import {ɵcomputeMsgId, ɵparseTranslation} from '@angular/localize';
 import {ɵParsedTranslation} from '@angular/localize/private';
 import {transformSync} from '@babel/core';
@@ -13,8 +13,15 @@ import {transformSync} from '@babel/core';
 import {Diagnostics} from '../../../src/diagnostics';
 import {TranslatePluginOptions} from '../../../src/source_file_utils';
 import {makeEs2015TranslatePlugin} from '../../../src/translate/source_files/es2015_translate_plugin';
+import {runInNativeFileSystem} from '../../helpers';
+
+runInNativeFileSystem(() => {
+  let fs: FileSystem;
+
+  beforeEach(() => {
+    fs = getFileSystem();
+  });
 
-runInEachFileSystem(() => {
   describe('makeEs2015Plugin', () => {
     describe('(no translations)', () => {
       it('should transform `$localize` tags with binary expression', () => {
@@ -172,9 +179,12 @@ runInEachFileSystem(() => {
   function transformCode(
       input: string, translations: Record<string, ɵParsedTranslation> = {},
       pluginOptions?: TranslatePluginOptions, diagnostics = new Diagnostics()): string {
+    const cwd = fs.resolve('/');
+    const filename = fs.resolve(cwd, 'app/dist/test.js');
     return transformSync(input, {
              plugins: [makeEs2015TranslatePlugin(diagnostics, translations, pluginOptions)],
-             filename: '/app/dist/test.js'
+             filename,
+             cwd,
            })!.code!;
   }
 });
diff --git a/packages/localize/src/tools/test/translate/source_files/es5_translate_plugin_spec.ts b/packages/localize/src/tools/test/translate/source_files/es5_translate_plugin_spec.ts
index c89294b5e8..a562c250e3 100644
--- a/packages/localize/src/tools/test/translate/source_files/es5_translate_plugin_spec.ts
+++ b/packages/localize/src/tools/test/translate/source_files/es5_translate_plugin_spec.ts
@@ -5,7 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import {runInEachFileSystem} from '@angular/compiler-cli/src/ngtsc/file_system/testing';
+import {FileSystem, getFileSystem, PathSegment, relativeFrom} from '@angular/compiler-cli/src/ngtsc/file_system';
 import {ɵcomputeMsgId, ɵparseTranslation} from '@angular/localize';
 import {ɵParsedTranslation} from '@angular/localize/private';
 import {transformSync} from '@babel/core';
@@ -13,8 +13,17 @@ import {transformSync} from '@babel/core';
 import {Diagnostics} from '../../../src/diagnostics';
 import {TranslatePluginOptions} from '../../../src/source_file_utils';
 import {makeEs5TranslatePlugin} from '../../../src/translate/source_files/es5_translate_plugin';
+import {runInNativeFileSystem} from '../../helpers';
+
+runInNativeFileSystem(() => {
+  let fs: FileSystem;
+  let testPath: PathSegment;
+
+  beforeEach(() => {
+    fs = getFileSystem();
+    testPath = relativeFrom('app/dist/test.js');
+  });
 
-runInEachFileSystem(() => {
   describe('makeEs5Plugin', () => {
     describe('(no translations)', () => {
       it('should transform `$localize` calls with binary expression', () => {
@@ -142,7 +151,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.hasErrors).toBe(true);
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
-             message: '/app/dist/test.js: `$localize` called without any arguments.\n' +
+             message: `${testPath}: \`$localize\` called without any arguments.\n` +
                  '> 1 | $localize()\n' +
                  '    | ^^^^^^^^^^^',
            });
@@ -156,8 +165,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.hasErrors).toBe(true);
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
-             message:
-                 '/app/dist/test.js: Unexpected argument to `$localize` (expected an array).\n' +
+             message: `${testPath}: Unexpected argument to \`$localize\` (expected an array).\n` +
                  '> 1 | $localize(...x)\n' +
                  '    |           ^^^^',
            });
@@ -172,7 +180,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
              message:
-                 '/app/dist/test.js: Unexpected messageParts for `$localize` (expected an array of strings).\n' +
+                 `${testPath}: Unexpected messageParts for \`$localize\` (expected an array of strings).\n` +
                  '> 1 | $localize(null, [])\n' +
                  '    |           ^^^^',
            });
@@ -187,7 +195,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
              message:
-                 '/app/dist/test.js: Unexpected `raw` argument to the "makeTemplateObject()" function (expected an expression).\n' +
+                 `${testPath}: Unexpected \`raw\` argument to the "makeTemplateObject()" function (expected an expression).\n` +
                  '> 1 | $localize(__makeTemplateObject([], ...[]))\n' +
                  '    |                                    ^^^^^',
            });
@@ -202,7 +210,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
              message:
-                 '/app/dist/test.js: Unexpected `cooked` argument to the "makeTemplateObject()" function (expected an expression).\n' +
+                 `${testPath}: Unexpected \`cooked\` argument to the "makeTemplateObject()" function (expected an expression).\n` +
                  '> 1 | $localize(__makeTemplateObject(...[], []))\n' +
                  '    |                                ^^^^^',
            });
@@ -217,7 +225,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
              message:
-                 '/app/dist/test.js: Unexpected messageParts for `$localize` (expected an array of strings).\n' +
+                 `${testPath}: Unexpected messageParts for \`$localize\` (expected an array of strings).\n` +
                  '> 1 | $localize(__makeTemplateObject(["a", 12, "b"], ["a", "12", "b"]))\n' +
                  '    |                                ^^^^^^^^^^^^^^',
            });
@@ -232,7 +240,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
              message:
-                 '/app/dist/test.js: Unexpected messageParts for `$localize` (expected an array of strings).\n' +
+                 `${testPath}: Unexpected messageParts for \`$localize\` (expected an array of strings).\n` +
                  '> 1 | $localize(__makeTemplateObject(["a", "12", "b"], ["a", 12, "b"]))\n' +
                  '    |                                                  ^^^^^^^^^^^^^^',
            });
@@ -247,7 +255,7 @@ runInEachFileSystem(() => {
            expect(diagnostics.messages[0]).toEqual({
              type: 'error',
              message:
-                 '/app/dist/test.js: Invalid substitutions for `$localize` (expected all substitution arguments to be expressions).\n' +
+                 `${testPath}: Invalid substitutions for \`$localize\` (expected all substitution arguments to be expressions).\n` +
                  '> 1 | $localize(__makeTemplateObject(["a", "b"], ["a", "b"]), ...[])\n' +
                  '    |                                                         ^^^^^',
            });
@@ -361,9 +369,12 @@ runInEachFileSystem(() => {
   function transformCode(
       input: string, translations: Record<string, ɵParsedTranslation> = {},
       pluginOptions?: TranslatePluginOptions, diagnostics = new Diagnostics()): string {
+    const cwd = fs.resolve('/');
+    const filename = fs.resolve(cwd, testPath);
     return transformSync(input, {
              plugins: [makeEs5TranslatePlugin(diagnostics, translations, pluginOptions)],
-             filename: '/app/dist/test.js'
+             filename,
+             cwd,
            })!.code!;
   }
 });
diff --git a/packages/localize/src/tools/test/translate/source_files/source_file_translation_handler_spec.ts b/packages/localize/src/tools/test/translate/source_files/source_file_translation_handler_spec.ts
index c8a09c4c57..aa9ae1dbd9 100644
--- a/packages/localize/src/tools/test/translate/source_files/source_file_translation_handler_spec.ts
+++ b/packages/localize/src/tools/test/translate/source_files/source_file_translation_handler_spec.ts
@@ -23,7 +23,7 @@ runInEachFileSystem(() => {
 
     beforeEach(() => {
       fs = getFileSystem();
-      rootPath = absoluteFrom('/root/path');
+      rootPath = absoluteFrom('/src/path');
       filePath = relativeFrom('relative/path.js');
       enTranslationPath = absoluteFrom('/translations/en/relative/path.js');
       enUSTranslationPath = absoluteFrom('/translations/en-US/relative/path.js');