function getPropRef(node, nodes, file, scope) {
const prop = node.property;
const key = t.toComputedKey(node, prop);
if (t.isLiteral(key) && t.isPureish(key)) return key;
const temp = scope.generateUidIdentifierBasedOnNode(prop);
nodes.push(t.variableDeclaration("var", [
t.variableDeclarator(temp, prop)
]));
return temp;
}
isPure(node, constantsOnly?: boolean) {
if (t.isIdentifier(node)) {
let binding = this.getBinding(node.name);
if (!binding) return false;
if (constantsOnly) return binding.constant;
return true;
} else if (t.isClass(node)) {
if (node.superClass && !this.isPure(node.superClass, constantsOnly)) return false;
return this.isPure(node.body, constantsOnly);
} else if (t.isClassBody(node)) {
for (let method of node.body) {
if (!this.isPure(method, constantsOnly)) return false;
}
return true;
} else if (t.isBinary(node)) {
return this.isPure(node.left, constantsOnly) && this.isPure(node.right, constantsOnly);
} else if (t.isArrayExpression(node)) {
for (let elem of (node.elements: Array<Object>)) {
if (!this.isPure(elem, constantsOnly)) return false;
}
return true;
} else if (t.isObjectExpression(node)) {
for (let prop of (node.properties: Array<Object>)) {
if (!this.isPure(prop, constantsOnly)) return false;
}
return true;
} else if (t.isClassMethod(node)) {
if (node.computed && !this.isPure(node.key, constantsOnly)) return false;
if (node.kind === "get" || node.kind === "set") return false;
return true;
} else if (t.isClassProperty(node) || t.isObjectProperty(node)) {
if (node.computed && !this.isPure(node.key, constantsOnly)) return false;
return this.isPure(node.value, constantsOnly);
} else if (t.isUnaryExpression(node)) {
return this.isPure(node.argument, constantsOnly);
} else {
return t.isPureish(node);
}
}