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build: remove unnecessary polyfills from tests (#42567) 

Removes the polyfills for `MutationObserver` and `setPrototypeOf` from our testing setup, because none of the browsers that we support require them. It also removes a bit of code and one external dependency.

PR Close #42567
This commit is contained in:
Kristiyan Kostadinov 2021-06-13 11:05:00 +02:00 committed by Alex Rickabaugh
parent 4001e9d808
commit a66dd8834c
4 changed files with 29 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
karma-js.conf.js
View File

@ -59,7 +59,6 @@ module.exports = function(config) {
included: false,
watched: false
},
{pattern: 'node_modules/mutation-observer/index.js', included: false, watched: false},
{pattern: 'node_modules/rxjs/**', included: false, watched: false, served: true},
'node_modules/reflect-metadata/Reflect.js',

1
package.json
View File

@ -191,7 +191,6 @@
"karma-sauce-launcher": "^2.0.2",
"madge": "^4.0.2",
"multimatch": "^5.0.0",
"mutation-observer": "^1.0.3",
"nock": "^13.0.3",
"ora": "^5.0.0",
"prettier": "^2.3.0",

47
test-main.js
View File

@ -134,42 +134,6 @@ Promise
function loadCustomElementsPolyfills() {
var loadedPromise = Promise.resolve();
// The custom elements polyfill relies on `MutationObserver`.
if (!window.MutationObserver) {
loadedPromise = loadedPromise
.then(function() {
return System.import('node_modules/mutation-observer/index.js');
})
.then(function(MutationObserver) {
window.MutationObserver = MutationObserver;
});
}
// The custom elements polyfill relies on `Object.setPrototypeOf()`.
if (!Object.setPrototypeOf) {
var getDescriptor = function getDescriptor(obj, prop) {
var descriptor;
while (obj && !descriptor) {
descriptor = Object.getOwnPropertyDescriptor(obj, prop);
obj = Object.getPrototypeOf(obj);
}
return descriptor || {};
};
var setPrototypeOf = function setPrototypeOf(obj, proto) {
for (var prop in proto) {
if (!obj.hasOwnProperty(prop)) {
Object.defineProperty(obj, prop, getDescriptor(proto, prop));
}
}
return obj;
};
Object.defineProperty(setPrototypeOf, '$$shimmed', {value: true});
Object.setPrototypeOf = setPrototypeOf;
}
// The custom elements polyfill will patch properties and methods on `(HTML)Element` and `Node`
// (among others), including `(HTML)Element#innerHTML` and `Node#removeChild()`:
// https://github.com/webcomponents/custom-elements/blob/4f7072c0dbda4beb505d16967acfffd33337b325/src/Patch/Element.js#L28-L73
@ -209,11 +173,7 @@ function loadCustomElementsPolyfills() {
// Allow ES5 functions as custom element constructors.
'node_modules/@webcomponents/custom-elements/src/native-shim.js';
loadedPromise = loadedPromise
.then(function() {
return System.import(polyfillPath);
})
.then(function() {
return System.import(polyfillPath).then(function() {
// `packages/compiler/test/schema/schema_extractor.ts` relies on
// `HTMLElement.name`, but custom element polyfills will replace
// `HTMLElement` with an anonymous function.
@ -231,8 +191,7 @@ function loadCustomElementsPolyfills() {
} else {
var patchTarget = patchTargets[prop];
var originalDescriptor = originalDescriptors[prop];
var patchedDescriptor =
Object.getOwnPropertyDescriptor(patchTarget, prop);
var patchedDescriptor = Object.getOwnPropertyDescriptor(patchTarget, prop);
window[patchMethod] = function() {
Object.defineProperty(patchTarget, prop, patchedDescriptor);
@ -247,8 +206,6 @@ function loadCustomElementsPolyfills() {
}
});
});
return loadedPromise;
}
function onlySpecFiles(path) {

5
yarn.lock
View File

@ -9178,11 +9178,6 @@ multimatch@*, multimatch@^5.0.0:
arrify "^2.0.1"
minimatch "^3.0.4"
mutation-observer@^1.0.3:
version "1.0.3"
resolved "https://registry.yarnpkg.com/mutation-observer/-/mutation-observer-1.0.3.tgz#42e9222b101bca82e5ba9d5a7acf4a14c0f263d0"
integrity sha512-M/O/4rF2h776hV7qGMZUH3utZLO/jK7p8rnNgGkjKUw8zCGjRQPxB8z6+5l8+VjRUQ3dNYu4vjqXYLr+U8ZVNA==
mute-stdout@^1.0.0:
version "1.0.1"
resolved "https://registry.yarnpkg.com/mute-stdout/-/mute-stdout-1.0.1.tgz#acb0300eb4de23a7ddeec014e3e96044b3472331"