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fix(language-service): determine index types accessed using dot notation (#33884)

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Commit 53fc2ed8bf added support for
determining index types accessed using index signatures, but did not
include support for index types accessed using dot notation:

```typescript
const obj<T>: { [key: string]: T };
obj['stringKey']. // gets `T.` completions
obj.stringKey.    // did not peviously get `T.` completions
```

This adds support for determining an index type accessed via dot
notation by rigging an object's symbol table to return the string index
signature type a property access refers to, if that property does not
explicitly exist on the object. This is very similar to @ivanwonder's
work in #29811.

`SymbolWrapper` now takes an additional parameter to explicitly set the
type of the symbol wrapped. This is done because
`SymbolTableWrapper#get` only has access to the symbol of the index
type, _not_ the index signature symbol itself. An attempt to get the
type of the index type will give an error.

Closes #29811
Closes https://github.com/angular/vscode-ng-language-service/issues/126

PR Close #33884
This commit is contained in:
ayazhafiz
2019-11-17 15:06:41 -06:00
committed by Miško Hevery
parent 6d7d2e439c
commit 49804fe017
3 changed files with 94 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
packages/language-service/test/diagnostics_spec.ts
View File

@ -119,13 +119,35 @@ describe('diagnostics', () => {
expect(diagnostics).toEqual([]);
});
it('should produce diagnostics for invalid index type property access', () => {
mockHost.override(TEST_TEMPLATE, `
describe('diagnostics for invalid indexed type property access', () => {
it('should work with numeric index signatures (arrays)', () => {
mockHost.override(TEST_TEMPLATE, `
{{heroes[0].badProperty}}`);
const diags = ngLS.getDiagnostics(TEST_TEMPLATE);
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toBe(`Identifier 'badProperty' is not defined. 'Hero' does not contain such a member`);
const diags = ngLS.getDiagnostics(TEST_TEMPLATE);
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toBe(`Identifier 'badProperty' is not defined. 'Hero' does not contain such a member`);
});
describe('with string index signatures', () => {
it('should work with index notation', () => {
mockHost.override(TEST_TEMPLATE, `
{{heroesByName['Jacky'].badProperty}}`);
const diags = ngLS.getDiagnostics(TEST_TEMPLATE);
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toBe(`Identifier 'badProperty' is not defined. 'Hero' does not contain such a member`);
});
it('should work with dot notation', () => {
mockHost.override(TEST_TEMPLATE, `
{{heroesByName.jacky.badProperty}}`);
const diags = ngLS.getDiagnostics(TEST_TEMPLATE);
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toBe(`Identifier 'badProperty' is not defined. 'Hero' does not contain such a member`);
});
});
});
it('should not produce errors on function.bind()', () => {