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Allowing static arguments() and static caller() for target "es6".

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Disallow non-function properties `static arguments` and `static caller`, though.
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about-code
2016-11-06 17:59:38 +01:00
parent d58b5c807c
commit d9a46e1ae6
4 changed files with 38 additions and 50 deletions
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64
src/compiler/checker.ts
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@@ -14764,49 +14764,43 @@ namespace ts {
}
}
// Static members may conflict with non-configurable non-writable built-in Function.prototype properties
// Static members may conflict with non-configurable non-writable built-in Function object properties
// see https://github.com/microsoft/typescript/issues/442.
function checkClassForStaticPropertyNameConflicts(node: ClassLikeDeclaration) {
const es5_descriptors: PropertyDescriptorMap = {
// see http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.3
// see http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.5
"name": { configurable: false, writable: false },
"length": { configurable: false, writable: false },
"prototype": { configurable: false, writable: false },
// see https://github.com/microsoft/typescript/issues/442
"caller": { configurable: false, writable: false },
"arguments": { configurable: false, writable: false }
};
const post_es5_descriptors: PropertyDescriptorMap = {
// see http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-function-constructor
// see http://www.ecma-international.org/ecma-262/6.0/#sec-function-instances
"name": { configurable: true, writable: false },
"length": { configurable: true, writable: false },
"prototype": { configurable: false, writable: false },
"caller": { configurable: false, writable: false },
"arguments": { configurable: false, writable: false }
};
const message = Diagnostics.Static_property_0_conflicts_with_built_in_property_Function_0_of_constructor_function_1;
const className = getSymbolOfNode(node).name;
for (const member of node.members) {
const isStatic = forEach(member.modifiers, (m: Modifier) => m.kind === SyntaxKind.StaticKeyword);
if (isStatic) {
const memberNameNode = member.name;
if (memberNameNode) {
const memberName = getPropertyNameForPropertyNameNode(memberNameNode);
let descriptor: PropertyDescriptor = undefined;
if (languageVersion <= ScriptTarget.ES5) {
descriptor = es5_descriptors.hasOwnProperty(memberName) ? es5_descriptors[memberName] : undefined;
}
else if (languageVersion > ScriptTarget.ES5) {
descriptor = post_es5_descriptors.hasOwnProperty(memberName) ? post_es5_descriptors[memberName] : undefined;
}
if (descriptor && descriptor.configurable === false && descriptor.writable === false) {
const isStatic = forEach(member.modifiers, (m: Modifier) => m.kind === SyntaxKind.StaticKeyword);
const isMethod = member.kind === SyntaxKind.MethodDeclaration;
const memberNameNode = member.name;
if (isStatic && memberNameNode) {
const memberName = getPropertyNameForPropertyNameNode(memberNameNode);
if (languageVersion <= ScriptTarget.ES5) { // ES3, ES5
// see also http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.3
// see also http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.5
if (memberName === "prototype" ||
memberName === "name" ||
memberName === "length" ||
memberName === "caller" ||
memberName === "arguments"
) {
error(memberNameNode, message, memberName, className);
}
}
else { // ES6+
// see also http://www.ecma-international.org/ecma-262/6.0/#sec-properties-of-the-function-constructor
// see also http://www.ecma-international.org/ecma-262/6.0/#sec-function-instances
if (memberName === "prototype") {
error(memberNameNode, message, memberName, className);
}
else if ((
memberName === "caller" ||
memberName === "arguments" ) &&
isMethod === false
) {
error(memberNameNode, message, memberName, className);
}
}
}
}
}