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fix corner case in evaluate (#4143)

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fixes #4142
This commit is contained in:
Alex Lam S.L
2020-09-22 05:11:25 +01:00
committed by GitHub
parent 12ac49b970
commit 3cca0d6249
2 changed files with 15 additions and 3 deletions
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5
lib/compress.js
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@@ -7767,12 +7767,11 @@ merge(Compressor.prototype, {
associative = compressor.option("unsafe_math"); associative = compressor.option("unsafe_math");
// +a - b => a - b // +a - b => a - b
// a - +b => a - b // a - +b => a - b
[ "left", "right" ].forEach(function(operand) { if (self.operator != "+") [ "left", "right" ].forEach(function(operand) {
var node = self[operand]; var node = self[operand];
if (node instanceof AST_UnaryPrefix && node.operator == "+") { if (node instanceof AST_UnaryPrefix && node.operator == "+") {
var exp = node.expression; var exp = node.expression;
if (exp.is_boolean(compressor) || exp.is_number(compressor) if (exp.is_boolean(compressor) || exp.is_number(compressor) || exp.is_string(compressor)) {
|| self.operator != "+" && exp.is_string(compressor)) {
self[operand] = exp; self[operand] = exp;
} }
} }

13
test/compress/numbers.js
View File

@@ -1322,3 +1322,16 @@ issue_4137: {
} }
expect_stdout: "0" expect_stdout: "0"
} }
issue_4142: {
options = {
evaluate: true,
}
input: {
console.log("" + +(0 === console));
}
expect: {
console.log("" + +(0 === console));
}
expect_stdout: "0"
}