loadable-ts-transformer/lib/index.js

TypeScript custom transformer for lodable-components SSR

"use strict";
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
    result["default"] = mod;
    return result;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var ts = __importStar(require("typescript"));
var chunk_name_1 = __importDefault(require("./properties/chunk-name"));
var require_async_1 = __importDefault(require("./properties/require-async"));
var require_sync_1 = __importDefault(require("./properties/require-sync"));
var is_ready_1 = __importDefault(require("./properties/is-ready"));
var resolve_1 = __importDefault(require("./properties/resolve"));
function isLoadableNode(node) {
    if (!ts.isCallExpression(node))
        return false;
    var identifier = node.expression;
    if (!ts.isIdentifier(identifier))
        return false;
    if (identifier.text !== 'loadable')
        return false;
    return true;
}
function collectImports(loadableCallExpressionNode, ctx) {
    var ret = [];
    function visit(node) {
        if (node.kind === ts.SyntaxKind.ImportKeyword) {
            ret.push(node.parent);
            return node;
        }
        return ts.visitEachChild(node, visit, ctx);
    }
    ts.visitNodes(loadableCallExpressionNode.arguments, visit);
    return ret;
}
function getFuncNode(loadableCallExpressionNode) {
    var arg = loadableCallExpressionNode.arguments[0];
    if (!arg)
        return;
    if (!ts.isArrowFunction(arg) && !ts.isFunctionExpression(arg))
        return;
    return arg;
}
function loadableTransformer(ctx) {
    function visitNode(node) {
        if (!isLoadableNode(node))
            return ts.visitEachChild(node, visitNode, ctx);
        var funcNode = getFuncNode(node);
        if (!funcNode)
            return node;
        // Collect dynamic import call expressions such as `import('./foo')`
        var imports = collectImports(node, ctx);
        // Ignore loadable function that does not have any "import" call
        if (imports.length === 0)
            return node;
        // Multiple imports call is not supported
        if (imports.length > 1) {
            throw new Error('loadable: multiple import calls inside `loadable()` function are not supported.');
        }
        var callNode = imports[0];
        var obj = ts.createObjectLiteral([
            chunk_name_1.default({ ctx: ctx, callNode: callNode, funcNode: funcNode }),
            is_ready_1.default(ctx),
            require_async_1.default(funcNode),
            require_sync_1.default(ctx),
            resolve_1.default(callNode),
        ], true);
        return ts.updateCall(node, node.expression, undefined, [obj]);
    }
    return function (source) { return ts.updateSourceFileNode(source, ts.visitNodes(source.statements, visitNode)); };
}
exports.loadableTransformer = loadableTransformer;