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Optional call expressions short circuit later member expressions

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This commit is contained in:
Justin Ridgewell
2017-06-07 01:58:31 -04:00
parent 54d9732d0b
commit 9e91ac54d3
7 changed files with 88 additions and 38 deletions
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50
packages/babel-plugin-transform-optional-chaining/src/index.js
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@@ -71,6 +71,30 @@ export default function ({ types: t }) {
}
}
function findReplacementPath(path) {
return path.find((path) => {
const { parentPath } = path;
if (path.key == "left" && parentPath.isAssignmentExpression()) {
return false;
}
if (path.key == "object" && parentPath.isMemberExpression()) {
return false;
}
if (path.key == "callee" && (parentPath.isCallExpression() || parentPath.isNewExpression())) {
return false;
}
if (path.key == "argument" && parentPath.isUpdateExpression()) {
return false;
}
if (path.key == "argument" && parentPath.isUnaryExpression({ operator: "delete" })) {
return false;
}
return true;
});
}
return {
inherits: syntaxOptionalChaining,
@@ -80,29 +104,7 @@ export default function ({ types: t }) {
return;
}
const replace = path.find((path) => {
const { parentPath } = path;
if (path.key == "left" && parentPath.isAssignmentExpression()) {
return false;
}
if (path.key == "object" && parentPath.isMemberExpression()) {
return false;
}
if (path.key == "callee" && (parentPath.isCallExpression() || parentPath.isNewExpression())) {
return false;
}
if (path.key == "argument" && parentPath.isUpdateExpression()) {
return false;
}
if (path.key == "argument" && parentPath.isUnaryExpression({ operator: "delete" })) {
return false;
}
return true;
});
optional(path, "object", replace);
optional(path, "object", findReplacementPath(path));
},
"NewExpression|CallExpression"(path) {
@@ -110,7 +112,7 @@ export default function ({ types: t }) {
return;
}
optional(path, "callee", path, path.isCallExpression(), this.opts.loose);
optional(path, "callee", findReplacementPath(path), path.isCallExpression(), this.opts.loose);
},
},
};