77 lines
3.0 KiB
Plaintext
77 lines
3.0 KiB
Plaintext
"use strict";
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var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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var desc = Object.getOwnPropertyDescriptor(m, k);
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if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
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desc = { enumerable: true, get: function() { return m[k]; } };
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}
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Object.defineProperty(o, k2, desc);
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}) : (function(o, m, k, k2) {
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if (k2 === undefined) k2 = k;
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o[k2] = m[k];
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}));
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var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
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Object.defineProperty(o, "default", { enumerable: true, value: v });
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}) : function(o, v) {
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o["default"] = v;
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});
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var __importStar = (this && this.__importStar) || (function () {
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var ownKeys = function(o) {
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ownKeys = Object.getOwnPropertyNames || function (o) {
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var ar = [];
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for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
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return ar;
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};
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return ownKeys(o);
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};
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return function (mod) {
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if (mod && mod.__esModule) return mod;
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var result = {};
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if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
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__setModuleDefault(result, mod);
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return result;
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.getContextualType = getContextualType;
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const ts = __importStar(require("typescript"));
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/**
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* Returns the contextual type of a given node.
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* Contextual type is the type of the target the node is going into.
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* i.e. the type of a called function's parameter, or the defined type of a variable declaration
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*/
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function getContextualType(checker, node) {
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const parent = node.parent;
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if (ts.isCallExpression(parent) || ts.isNewExpression(parent)) {
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if (node === parent.expression) {
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// is the callee, so has no contextual type
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return;
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}
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}
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else if (ts.isVariableDeclaration(parent) ||
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ts.isPropertyDeclaration(parent) ||
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ts.isParameter(parent)) {
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return parent.type ? checker.getTypeFromTypeNode(parent.type) : undefined;
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}
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else if (ts.isJsxExpression(parent)) {
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return checker.getContextualType(parent);
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}
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else if (ts.isIdentifier(node) &&
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(ts.isPropertyAssignment(parent) ||
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ts.isShorthandPropertyAssignment(parent))) {
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return checker.getContextualType(node);
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}
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else if (ts.isBinaryExpression(parent) &&
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parent.operatorToken.kind === ts.SyntaxKind.EqualsToken &&
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parent.right === node) {
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// is RHS of assignment
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return checker.getTypeAtLocation(parent.left);
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}
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else if (![ts.SyntaxKind.JsxExpression, ts.SyntaxKind.TemplateSpan].includes(parent.kind)) {
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// parent is not something we know we can get the contextual type of
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return;
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}
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// TODO - support return statement checking
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return checker.getContextualType(node);
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}
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