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test("non strict-mode by default", () => {
expect(isStrictMode()).toBeFalse();
});
test("use strict with double quotes", () => {
"use strict";
expect(isStrictMode()).toBeTrue();
});
// prettier-ignore
test("use strict with single quotes", () => {
'use strict';
expect(isStrictMode()).toBeTrue();
});
// prettier-ignore
test("use strict with backticks does not yield strict mode", () => {
`use strict`;
expect(isStrictMode()).toBeFalse();
});
// prettier-ignore
test("use strict with single quotes after statement does not yield strict mode code", () => {
;'use strict';
expect(isStrictMode()).toBeFalse();
});
// prettier-ignore
test("use strict with double quotes after statement does not yield strict mode code", () => {
;"use strict";
expect(isStrictMode()).toBeFalse();
});
test("use strict interrupted by a line continuation does not yield strict mode code", () => {
"use \
strict";
expect(isStrictMode()).toBeFalse();
});
test("strict mode propagates down the scope chain", () => {
"use strict";
expect(isStrictMode()).toBeTrue();
(function () {
expect(isStrictMode()).toBeTrue();
})();
});
test("strict mode does not propagate up the scope chain", () => {
expect(isStrictMode()).toBeFalse();
(function () {
"use strict";
expect(isStrictMode()).toBeTrue();
})();
expect(isStrictMode()).toBeFalse();
});
test('only the string "use strict" yields strict mode code', () => {
"use stric";
expect(isStrictMode()).toBeFalse();
});
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