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fix(language-service): fix error of array-index out of bounds exception (#33928) 

PR Close #33928
This commit is contained in:
ivanwonder 2019-11-27 03:11:28 +00:00 committed by Miško Hevery
parent 5a227d8d7c
commit c5006e025f
2 changed files with 9 additions and 1 deletions
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3
packages/language-service/src/typescript_symbols.ts
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@ -295,7 +295,8 @@ class TypeWrapper implements Symbol {
if (nType) {
// get the right tuple type by value, like 'var t: [number, string];'
if (nType.isUnion()) {
return new TypeWrapper(nType.types[value], this.context);
// return undefined if array index out of bound.
return nType.types[value] && new TypeWrapper(nType.types[value], this.context);
}
return new TypeWrapper(nType, this.context);
}

7
packages/language-service/test/diagnostics_spec.ts
View File

@ -159,6 +159,13 @@ describe('diagnostics', () => {
.toBe(`Identifier 'badProperty' is not defined. 'Hero' does not contain such a member`);
});
it('should not produce errors if tuple array index out of bound', () => {
mockHost.override(TEST_TEMPLATE, `
{{tupleArray[2].badProperty}}`);
const diags = ngLS.getDiagnostics(TEST_TEMPLATE);
expect(diags).toEqual([]);
});
it('should not produce errors on function.bind()', () => {
mockHost.override(TEST_TEMPLATE, `
<test-comp (test)="myClick.bind(this)">