c66b281856
This fixes an issue where this would be bound to the global object by default when operating in strict mode. According to the specification, the expected value for |this| when no binding is provided is undefined.
69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
test("non strict-mode by default", () => {
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expect(isStrictMode()).toBeFalse();
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});
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test("use strict with double quotes", () => {
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"use strict";
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expect(isStrictMode()).toBeTrue();
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});
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// prettier-ignore
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test("use strict with single quotes", () => {
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'use strict';
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expect(isStrictMode()).toBeTrue();
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});
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// prettier-ignore
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test("use strict with backticks does not yield strict mode", () => {
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`use strict`;
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expect(isStrictMode()).toBeFalse();
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});
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// prettier-ignore
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test("use strict with single quotes after statement does not yield strict mode code", () => {
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;'use strict';
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expect(isStrictMode()).toBeFalse();
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});
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// prettier-ignore
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test("use strict with double quotes after statement does not yield strict mode code", () => {
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;"use strict";
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expect(isStrictMode()).toBeFalse();
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});
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test("use strict interrupted by a line continuation does not yield strict mode code", () => {
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"use \
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strict";
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expect(isStrictMode()).toBeFalse();
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});
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test("strict mode propagates down the scope chain", () => {
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"use strict";
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expect(isStrictMode()).toBeTrue();
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(function () {
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expect(isStrictMode()).toBeTrue();
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})();
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});
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test("strict mode does not propagate up the scope chain", () => {
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expect(isStrictMode()).toBeFalse();
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(function () {
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"use strict";
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expect(isStrictMode()).toBeTrue();
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})();
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expect(isStrictMode()).toBeFalse();
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});
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test('only the string "use strict" yields strict mode code', () => {
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"use stric";
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expect(isStrictMode()).toBeFalse();
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});
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test("strict mode does not apply global object to |this|", () => {
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"use strict";
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let functionThis;
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(function () {
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functionThis = this;
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})();
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expect(functionThis).toBeUndefined();
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});
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