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refactor(ngcc): guard against a crash if source-map flattening fails (#35718) 

Source-maps in the wild could be badly formatted,
causing the source-map flattening processing to fail
unexpectedly. Rather than causing the whole of ngcc
to crash, we gracefully fallback to just returning the
generated source-map instead.

PR Close #35718
This commit is contained in:
Pete Bacon Darwin 2020-02-27 19:50:14 +00:00 committed by Matias Niemelä
parent 73cf7d5cb4
commit 5d8f7da3aa
3 changed files with 28 additions and 16 deletions
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2
packages/compiler-cli/ngcc/src/rendering/dts_renderer.ts
View File

@ -111,7 +111,7 @@ export class DtsRenderer {
this.dtsFormatter.addImports(
outputText, importManager.getAllImports(dtsFile.fileName), dtsFile);
return renderSourceAndMap(this.fs, dtsFile, outputText);
return renderSourceAndMap(this.logger, this.fs, dtsFile, outputText);
}
private getTypingsFilesToRender(

2
packages/compiler-cli/ngcc/src/rendering/renderer.ts
View File

@ -114,7 +114,7 @@ export class Renderer {
}
if (compiledFile || switchMarkerAnalysis || isEntryPoint) {
return renderSourceAndMap(this.fs, sourceFile, outputText);
return renderSourceAndMap(this.logger, this.fs, sourceFile, outputText);
} else {
return [];
}

40
packages/compiler-cli/ngcc/src/rendering/source_maps.ts
View File

@ -12,6 +12,7 @@ import {FileSystem, absoluteFromSourceFile, basename, absoluteFrom} from '../../
import {FileToWrite} from './utils';
import {SourceFileLoader} from '../sourcemaps/source_file_loader';
import {RawSourceMap} from '../sourcemaps/raw_source_map';
import {Logger} from '../logging/logger';
export interface SourceMapInfo {
source: string;
@ -24,28 +25,39 @@ export interface SourceMapInfo {
* with an appropriate source-map comment pointing to the merged source-map.
*/
export function renderSourceAndMap(
fs: FileSystem, sourceFile: ts.SourceFile, generatedMagicString: MagicString): FileToWrite[] {
logger: Logger, fs: FileSystem, sourceFile: ts.SourceFile,
generatedMagicString: MagicString): FileToWrite[] {
const generatedPath = absoluteFromSourceFile(sourceFile);
const generatedMapPath = absoluteFrom(`${generatedPath}.map`);
const generatedContent = generatedMagicString.toString();
const generatedMap: RawSourceMap = generatedMagicString.generateMap(
{file: generatedPath, source: generatedPath, includeContent: true});
const loader = new SourceFileLoader(fs);
const generatedFile = loader.loadSourceFile(
generatedPath, generatedContent, {map: generatedMap, mapPath: generatedMapPath});
try {
const loader = new SourceFileLoader(fs);
const generatedFile = loader.loadSourceFile(
generatedPath, generatedContent, {map: generatedMap, mapPath: generatedMapPath});
const rawMergedMap: RawSourceMap = generatedFile.renderFlattenedSourceMap();
const mergedMap = fromObject(rawMergedMap);
if (generatedFile.sources[0]?.inline) {
// The input source-map was inline so make the output one inline too.
return [{path: generatedPath, contents: `${generatedFile.contents}\n${mergedMap.toComment()}`}];
} else {
const sourceMapComment = generateMapFileComment(`${basename(generatedPath)}.map`);
const rawMergedMap: RawSourceMap = generatedFile.renderFlattenedSourceMap();
const mergedMap = fromObject(rawMergedMap);
if (generatedFile.sources[0]?.inline) {
// The input source-map was inline so make the output one inline too.
return [
{path: generatedPath, contents: `${generatedFile.contents}\n${mergedMap.toComment()}`}
];
} else {
const sourceMapComment = generateMapFileComment(`${basename(generatedPath)}.map`);
return [
{path: generatedPath, contents: `${generatedFile.contents}\n${sourceMapComment}`},
{path: generatedMapPath, contents: mergedMap.toJSON()}
];
}
} catch (e) {
logger.error(
`Error when flattening the source-map "${generatedMapPath}" for "${generatedPath}": ${e.toString()}`);
return [
{path: generatedPath, contents: `${generatedFile.contents}\n${sourceMapComment}`},
{path: generatedMapPath, contents: mergedMap.toJSON()}
{path: generatedPath, contents: generatedContent},
{path: generatedMapPath, contents: fromObject(generatedMap).toJSON()},
];
}
}