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fix(ivy): don't generate code for blank NgModule fields (#28387) 

Currently `compileNgModule` generates an empty array for optional fields that are omitted from an `NgModule` declaration (e.g. `bootstrap`, `exports`). This isn't necessary, because `defineNgModule` has some code to default these fields to empty arrays at runtime if they aren't defined. The following changes will only output code if there are values for the particular field.

PR Close #28387
This commit is contained in:
Kristiyan Kostadinov 2019-01-26 12:29:38 +01:00 committed by Jason Aden
parent 29513296fb
commit ebac5dba38
2 changed files with 33 additions and 13 deletions
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2
packages/compiler-cli/test/ngtsc/ngtsc_spec.ts
View File

@ -275,7 +275,7 @@ describe('ngtsc behavioral tests', () => {
expect(jsContents)
.toContain(
'i0.ɵdefineNgModule({ type: TestModule, bootstrap: [TestCmp], ' +
'declarations: [TestCmp], imports: [], exports: [] })');
'declarations: [TestCmp] })');
const dtsContents = env.getContents('test.d.ts');
expect(dtsContents)

34
packages/compiler/src/render3/r3_module_compiler.ts
View File

@ -64,14 +64,34 @@ export interface R3NgModuleMetadata {
*/
export function compileNgModule(meta: R3NgModuleMetadata): R3NgModuleDef {
const {type: moduleType, bootstrap, declarations, imports, exports} = meta;
const expression = o.importExpr(R3.defineNgModule).callFn([mapToMapExpression({
type: moduleType,
bootstrap: o.literalArr(bootstrap.map(ref => ref.value)),
declarations: o.literalArr(declarations.map(ref => ref.value)),
imports: o.literalArr(imports.map(ref => ref.value)),
exports: o.literalArr(exports.map(ref => ref.value)),
})]);
const definitionMap = {
type: moduleType
} as{
type: o.Expression,
bootstrap: o.LiteralArrayExpr,
declarations: o.LiteralArrayExpr,
imports: o.LiteralArrayExpr,
exports: o.LiteralArrayExpr
};
// Only generate the keys in the metadata if the arrays have values.
if (bootstrap.length) {
definitionMap.bootstrap = o.literalArr(bootstrap.map(ref => ref.value));
}
if (declarations.length) {
definitionMap.declarations = o.literalArr(declarations.map(ref => ref.value));
}
if (imports.length) {
definitionMap.imports = o.literalArr(imports.map(ref => ref.value));
}
if (exports.length) {
definitionMap.exports = o.literalArr(exports.map(ref => ref.value));
}
const expression = o.importExpr(R3.defineNgModule).callFn([mapToMapExpression(definitionMap)]);
const type = new o.ExpressionType(o.importExpr(R3.NgModuleDefWithMeta, [
new o.ExpressionType(moduleType), tupleTypeOf(declarations), tupleTypeOf(imports),
tupleTypeOf(exports)