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index.js
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index.js
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export default function ({ types: t, template }) {
const buildMutatorMapAssign = template(`
MUTATOR_MAP_REF[KEY] = MUTATOR_MAP_REF[KEY] || {};
MUTATOR_MAP_REF[KEY].KIND = VALUE;
`);
function getValue(prop) {
if (t.isObjectProperty(prop)) {
return prop.value;
} else if (t.isObjectMethod(prop)) {
return t.functionExpression(null, prop.params, prop.body, prop.generator, prop.async);
}
}
function pushAssign(objId, prop, body) {
if (prop.kind === "get" && prop.kind === "set") {
pushMutatorDefine(objId, prop, body);
} else {
body.push(t.expressionStatement(
t.assignmentExpression(
"=",
t.memberExpression(objId, prop.key, prop.computed || t.isLiteral(prop.key)),
getValue(prop)
)
));
}
}
function pushMutatorDefine({ objId, body, getMutatorId, scope }, prop) {
let key = !prop.computed && t.isIdentifier(prop.key) ? t.stringLiteral(prop.key.name) : prop.key;
const maybeMemoise = scope.maybeGenerateMemoised(key);
if (maybeMemoise) {
body.push(t.expressionStatement(t.assignmentExpression("=", maybeMemoise, key)));
key = maybeMemoise;
}
body.push(...buildMutatorMapAssign({
MUTATOR_MAP_REF: getMutatorId(),
KEY: key,
VALUE: getValue(prop),
KIND: t.identifier(prop.kind),
}));
}
function loose(info) {
for (const prop of info.computedProps) {
if (prop.kind === "get" || prop.kind === "set") {
pushMutatorDefine(info, prop);
} else {
pushAssign(info.objId, prop, info.body);
}
}
}
function spec(info) {
const { objId, body, computedProps, state } = info;
for (const prop of computedProps) {
const key = t.toComputedKey(prop);
if (prop.kind === "get" || prop.kind === "set") {
pushMutatorDefine(info, prop);
} else if (t.isStringLiteral(key, { value: "__proto__" })) {
pushAssign(objId, prop, body);
} else {
if (computedProps.length === 1) {
return t.callExpression(state.addHelper("defineProperty"), [
info.initPropExpression,
key,
getValue(prop),
]);
} else {
body.push(t.expressionStatement(
t.callExpression(state.addHelper("defineProperty"), [
objId,
key,
getValue(prop),
])
));
}
}
}
}
return {
visitor: {
ObjectExpression: {
exit(path, state) {
const { node, parent, scope } = path;
let hasComputed = false;
for (const prop of (node.properties: Array<Object>)) {
hasComputed = prop.computed === true;
if (hasComputed) break;
}
if (!hasComputed) return;
// put all getters/setters into the first object expression as well as all initialisers up
// to the first computed property
const initProps = [];
const computedProps = [];
let foundComputed = false;
for (const prop of node.properties) {
if (prop.computed) {
foundComputed = true;
}
if (foundComputed) {
computedProps.push(prop);
} else {
initProps.push(prop);
}
}
const objId = scope.generateUidIdentifierBasedOnNode(parent);
const initPropExpression = t.objectExpression(initProps);
const body = [];
body.push(t.variableDeclaration("var", [
t.variableDeclarator(objId, initPropExpression),
]));
let callback = spec;
if (state.opts.loose) callback = loose;
let mutatorRef;
const getMutatorId = function () {
if (!mutatorRef) {
mutatorRef = scope.generateUidIdentifier("mutatorMap");
body.push(t.variableDeclaration("var", [
t.variableDeclarator(mutatorRef, t.objectExpression([])),
]));
}
return mutatorRef;
};
const single = callback({
scope,
objId,
body,
computedProps,
initPropExpression,
getMutatorId,
state,
});
if (mutatorRef) {
body.push(t.expressionStatement(t.callExpression(
state.addHelper("defineEnumerableProperties"),
[objId, mutatorRef]
)));
}
if (single) {
path.replaceWith(single);
} else {
body.push(t.expressionStatement(objId));
path.replaceWithMultiple(body);
}
},
},
},
};
}