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Allow const assertions in no-object-literal-type-assertion #4681

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merged 4 commits into from May 7, 2019
Merged

Allow const assertions in no-object-literal-type-assertion #4681

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8b2fcc5
Ignore const assertions
asmundg Apr 24, 2019
21afb1e
Bump typescript to get utility function for const assert
asmundg Apr 25, 2019
8670ee4
Make sure tests pass on older typescripts
asmundg Apr 25, 2019
46886ec
Clean up tests and doc
asmundg May 6, 2019
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2 changes: 1 addition & 1 deletion package.json
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Expand Up @@ -73,7 +73,7 @@
"tslint-config-prettier": "^1.18.0",
"tslint-plugin-prettier": "^2.0.1",
"tslint-test-config-non-relative": "file:test/external/tslint-test-config-non-relative",
"typescript": "~3.1.6",
"typescript": "~3.4.0",
"yarn-deduplicate": "^1.1.1"
},
"engines": {
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7 changes: 7 additions & 0 deletions src/rules/noObjectLiteralTypeAssertionRule.ts
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Expand Up @@ -86,6 +86,13 @@ function walk(ctx: Lint.WalkContext<Options>): void {
if (
isAssertionExpression(node) &&
node.type.kind !== ts.SyntaxKind.AnyKeyword &&
// Allow const assertions, introduced in TS 3.4
!(
node.type.kind === ts.SyntaxKind.TypeReference &&
(ts.isConstTypeReference !== undefined
? ts.isConstTypeReference(node.type)
: node.type.getText(ctx.sourceFile) === "const")
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) &&
// Compare with UnknownKeyword if using TS 3.0 or above
(!!(ts.SyntaxKind as any).UnknownKeyword
? node.type.kind !== (ts.SyntaxKind as any).UnknownKeyword
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4 changes: 4 additions & 0 deletions test/rules/no-object-literal-type-assertion/default/test.ts.lint
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Expand Up @@ -16,6 +16,10 @@ x as T;
{} as unknown;
<unknown> {};

// Allow const assertion
({}) as const;
<const> ({});
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foo({} as T);
~~~~~~~ [0]

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8 changes: 4 additions & 4 deletions yarn.lock
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Expand Up @@ -1851,10 +1851,10 @@ type-detect@^1.0.0:
resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-1.0.0.tgz#762217cc06db258ec48908a1298e8b95121e8ea2"
integrity sha1-diIXzAbbJY7EiQihKY6LlRIejqI=

typescript@~3.1.6:
version "3.1.6"
resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.6.tgz#b6543a83cfc8c2befb3f4c8fba6896f5b0c9be68"
integrity sha512-tDMYfVtvpb96msS1lDX9MEdHrW4yOuZ4Kdc4Him9oU796XldPYF/t2+uKoX0BBa0hXXwDlqYQbXY5Rzjzc5hBA==
typescript@~3.4.0:
version "3.4.5"
resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.5.tgz#2d2618d10bb566572b8d7aad5180d84257d70a99"
integrity sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==

uglify-js@^3.1.4:
version "3.5.4"
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