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https://github.com/angular/angular
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c241f63e8d
The decorator downlevel transform is never used for actual class decorators because Angular class decorators rely on immediate execution for JIT. Initially we also supported downleveling of class decorators for View Engine library output, but libraries are shipped using partial compilation output and are not using this transform anymore. The transform is exclusively used for JIT processing, commonly for test files to help ease temporal dead-zone/forward-ref issues. We can remove the class decorator downlevel logic to remove technical debt. PR Close #49351
49 lines
1.7 KiB
TypeScript
49 lines
1.7 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/**
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* @fileoverview
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* This file is used as a private API channel to shared Angular FW APIs with @angular/cli.
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*
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* Any changes to this file should be discussed with the Angular CLI team.
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*/
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import ts from 'typescript';
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import {TypeScriptReflectionHost} from '../src/ngtsc/reflection';
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import {getDownlevelDecoratorsTransform} from '../src/transformers/downlevel_decorators_transform/index';
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/**
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* Known values for global variables in `@angular/core` that Terser should set using
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* https://github.com/terser-js/terser#conditional-compilation
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*/
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export const GLOBAL_DEFS_FOR_TERSER = {
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ngDevMode: false,
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ngI18nClosureMode: false,
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};
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export const GLOBAL_DEFS_FOR_TERSER_WITH_AOT = {
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...GLOBAL_DEFS_FOR_TERSER,
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ngJitMode: false,
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};
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/**
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* Transform for downleveling Angular decorators and Angular-decorated class constructor
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* parameters for dependency injection. This transform can be used by the CLI for JIT-mode
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* compilation where constructor parameters and associated Angular decorators should be
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* downleveled so that apps are not exposed to the ES2015 temporal dead zone limitation
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* in TypeScript. See https://github.com/angular/angular-cli/pull/14473 for more details.
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*/
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export function constructorParametersDownlevelTransform(program: ts.Program):
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ts.TransformerFactory<ts.SourceFile> {
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const typeChecker = program.getTypeChecker();
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const reflectionHost = new TypeScriptReflectionHost(typeChecker);
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return getDownlevelDecoratorsTransform(
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typeChecker, reflectionHost, [], /* isCore */ false,
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/* enableClosureCompiler */ false);
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}
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