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https://tc39.es/ecma262/#sec-directive-prologues-and-the-use-strict-directive A Use Strict Directive is an ExpressionStatement in a Directive Prologue whose StringLiteral is either of the exact code point sequences "use strict" or 'use strict'. A Use Strict Directive may not contain an EscapeSequence or LineContinuation.
48 lines
972 B
JavaScript
48 lines
972 B
JavaScript
test("valid 'use strict; directive", () => {
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expect(
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(() => {
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"use strict";
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return isStrictMode();
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})()
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).toBeTrue();
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expect(
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(() => {
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'use strict';
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return isStrictMode();
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})()
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).toBeTrue();
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});
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test("invalid 'use strict; directive", () => {
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expect(
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(() => {
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" use strict ";
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return isStrictMode();
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})()
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).toBeFalse();
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expect(
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(() => {
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`use strict`;
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return isStrictMode();
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})()
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).toBeFalse();
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expect(
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(() => {
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"use\
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strict";
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return isStrictMode();
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})()
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).toBeFalse();
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expect(
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(() => {
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"use\ strict";
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return isStrictMode();
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})()
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).toBeFalse();
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expect(
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(() => {
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"use \163trict";
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return isStrictMode();
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})()
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).toBeFalse();
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});
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