TypeScript Version: 2.5.2 and 2.6.0-dev.20170909
Code
Background: I was trying to find a way to add a member to a class exported using export = ClassName; (which is not the point of this issue) and spotted a compiler crash with below code (which is the point of this issue).
// types.d.ts
declare module "foo" {
class Foo {
static a(): void;
a(): void;
}
namespace Foo {}
export = Foo;
}
// main.ts
declare module "foo" {
function test(): void;
namespace prototype {
function test(): void;
}
}
import Foo = require('foo');
const m = new Foo();
m.test();
Foo.test();Expected behavior:
Some error is reported.
Actual behavior:
It throws:
/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:18935
result.declarations = symbol.declarations.slice(0);
^
TypeError: Cannot read property 'slice' of undefined
at cloneSymbol (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:18935:54)
at /Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:18994:40
at Map.forEach (native)
at mergeSymbolTable (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:18987:20)
at mergeSymbol (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:18968:21)
at mergeModuleAugmentation (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:19021:21)
at initializeTypeChecker (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:36847:25)
at Object.createTypeChecker (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:18854:9)
at getDiagnosticsProducingTypeChecker (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:56392:93)
at Object.getGlobalDiagnostics (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:56720:53)
at compileProgram (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:59465:78)
at compile (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:59424:26)
at performCompilation (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:59313:33)
at Object.executeCommandLine (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:59256:9)
at Object.<anonymous> (/Users/devoto13/Projects/ts-augment/node_modules/typescript/lib/tsc.js:59614:4)
at Module._compile (module.js:573:30)
at Object.Module._extensions..js (module.js:584:10)
at Module.load (module.js:507:32)
at tryModuleLoad (module.js:470:12)
at Function.Module._load (module.js:462:3)
at Module.require (module.js:517:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (/Users/devoto13/Projects/ts-augment/node_modules/typescript/bin/tsc:2:1)
at Module._compile (module.js:573:30)
at Object.Module._extensions..js (module.js:584:10)
at Module.load (module.js:507:32)
at tryModuleLoad (module.js:470:12)
at Function.Module._load (module.js:462:3)
at Function.Module.runMain (module.js:609:10)
at startup (bootstrap_node.js:158:16)
at bootstrap_node.js:598:3
TypeScript Version: 2.5.2 and 2.6.0-dev.20170909
Code
Background: I was trying to find a way to add a member to a class exported using
export = ClassName;(which is not the point of this issue) and spotted a compiler crash with below code (which is the point of this issue).Expected behavior:
Some error is reported.
Actual behavior:
It throws: