skills/angular__angular
1
0
Fork 0
mirror of https://github.com/angular/angular.git synced 2026-09-14 13:54:52 +08:00
Code Issues Packages Projects Releases Wiki Activity

chore: add @__PURE__ annotation to ES5 output for uglify (#4147)

Browse Source
This commit is contained in:
Jeremy Elbourn
2017-04-20 18:57:21 -07:00
committed by Kara
parent 380b390568
commit 76faae5f37
2 changed files with 33 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/gulp/util/annotate-pure.ts
+22
View File
@@ -0,0 +1,22 @@
const iifeExpression =
new RegExp('^(var (\\S+) = )(\\(function \\(\\) \\{\\n(?: ' +
'(?:\\/\\*\\*| \\*|\\*\\/|\\/\\/)[^\\n]*\\n)* function \\2\\([^\\)]*\\) \\{\\n)', 'mg');
/**
* Adds `@__PURE__` annotation comments to IIFEs containing ES5-downleveled classes generated by
* TypeScript so that Uglify can tree-shake classes that are not referenced.
*
* @param fileContent The content of the file for which `@__PURE__` will be added.
* @returns The content of the file with `@__PURE__` annotations added.
*/
export function addPureAnnotations(fileContent: string) {
return fileContent
// Prefix downleveled classes w/ the @__PURE__ annotation.
.replace(iifeExpression, '$1/*@__PURE__*/$3')
// Prefix downleveled classes that extend another class w/ the @__PURE__ annotation
.replace(
/^(var (\S+) = )(\(function \(_super\) \{\n __extends\(\2, _super\);\n)/mg,
'$1/*@__PURE__*/$3'
);
}
tools/gulp/util/package-build.ts
+11
View File
@@ -10,6 +10,7 @@ import {
import {
DIST_BUNDLES, DIST_ROOT, SOURCE_ROOT, PROJECT_ROOT, LICENSE_BANNER, MATERIAL_VERSION
} from '../constants';
import {addPureAnnotations} from './annotate-pure';
// There are no type definitions available for these imports.
const uglify = require('uglify-js');
@@ -38,6 +39,7 @@ export function composeRelease(packageName: string) {
updatePackageVersion(releasePath);
createTypingFile(releasePath, packageName);
createMetadataFile(releasePath, packageName);
addPureAnnotationCommentsToEs5Bundle(releasePath, packageName);
}
/** Builds the bundles for the specified package. */
@@ -156,3 +158,12 @@ function inlinePackageMetadataFiles(packagePath: string) {
writeFileSync(path , JSON.stringify(metadata), 'utf-8');
});
}
/** Adds Uglify "@__PURE__" decorations to the generated ES5 bundle. */
function addPureAnnotationCommentsToEs5Bundle(outputDir: string, entryName: string) {
const es5BundlePath = join(outputDir, '@angular', `${entryName}.es5.js`);
const originalContent = readFileSync(es5BundlePath, 'utf-8');
const annotatedContent = addPureAnnotations(originalContent);
writeFileSync(es5BundlePath, annotatedContent, 'utf-8');
}