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https://tc39.es/ecma262/#sec-functiondeclarations-in-ifstatement-statement-clauses B.3.4 FunctionDeclarations in IfStatement Statement Clauses The following augments the IfStatement production in 13.6: IfStatement[Yield, Await, Return] : if ( Expression[+In, ?Yield, ?Await] ) FunctionDeclaration[?Yield, ?Await, ~Default] else Statement[?Yield, ?Await, ?Return] if ( Expression[+In, ?Yield, ?Await] ) Statement[?Yield, ?Await, ?Return] else FunctionDeclaration[?Yield, ?Await, ~Default] if ( Expression[+In, ?Yield, ?Await] ) FunctionDeclaration[?Yield, ?Await, ~Default] else FunctionDeclaration[?Yield, ?Await, ~Default] if ( Expression[+In, ?Yield, ?Await] ) FunctionDeclaration[?Yield, ?Await, ~Default] This production only applies when parsing non-strict code. Code matching this production is processed as if each matching occurrence of FunctionDeclaration[?Yield, ?Await, ~Default] was the sole StatementListItem of a BlockStatement occupying that position in the source code. The semantics of such a synthetic BlockStatement includes the web legacy compatibility semantics specified in B.3.3.
41 lines
1.2 KiB
JavaScript
41 lines
1.2 KiB
JavaScript
describe("function declarations in if statement clauses", () => {
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test("if clause", () => {
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if (true) function foo() {}
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if (false) function bar() {}
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expect(typeof globalThis.foo).toBe("function");
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expect(typeof globalThis.bar).toBe("undefined");
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});
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test("else clause", () => {
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if (false);
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else function foo() {}
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if (true);
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else function bar() {}
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expect(typeof globalThis.foo).toBe("function");
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expect(typeof globalThis.bar).toBe("undefined");
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});
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test("if and else clause", () => {
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if (true) function foo() {}
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else function bar() {}
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expect(typeof globalThis.foo).toBe("function");
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expect(typeof globalThis.bar).toBe("undefined");
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});
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test("syntax error in strict mode", () => {
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expect(`
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"use strict";
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if (true) function foo() {}
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`).not.toEval();
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expect(`
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"use strict";
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if (false);
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else function foo() {}
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`).not.toEval();
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expect(`
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"use strict";
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if (false) function foo() {}
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else function bar() {}
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`).not.toEval();
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});
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});
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