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prohibit let/const redeclaration (#2277)

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fixes #2270
This commit is contained in:
Alex Lam S.L
2017-08-14 12:31:12 +08:00
committed by GitHub
parent 2bf8216e50
commit a5461e0adc
5 changed files with 63 additions and 18 deletions
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30
test/mocha/minify.js
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@@ -291,4 +291,34 @@ describe("minify", function() {
assert.strictEqual(result.code, "alert({bar:42});");
});
});
describe("duplicated block-scoped declarations", function() {
[
"let a=1;let a=2;",
"let a=1;var a=2;",
"var a=1;let a=2;",
"let[a]=[1];var a=2;",
"let a=1;var[a]=[2];",
"let[a]=[1];var[a]=[2];",
"const a=1;const a=2;",
"const a=1;var a=2;",
"var a=1;const a=2;",
"const[a]=[1];var a=2;",
"const a=1;var[a]=[2];",
"const[a]=[1];var[a]=[2];",
].forEach(function(code) {
it(code, function() {
var result = Uglify.minify(code, {
compress: false,
mangle: false
});
assert.strictEqual(result.error, undefined);
assert.strictEqual(result.code, code);
result = Uglify.minify(code);
var err = result.error;
assert.ok(err instanceof Error);
assert.strictEqual(err.stack.split(/\n/)[0], "SyntaxError: a redeclared");
});
});
});
});