add type for compilation error

remix-tests/src/compiler.ts

@@ -2,7 +2,7 @@ import fs from './fileSystem'
 import async from 'async'
 import path from 'path'
 let RemixCompiler = require('remix-solidity').Compiler
-import { SrcIfc, CompilerConfiguration } from './types'
+import { SrcIfc, CompilerConfiguration, CompilationErrors } from './types'
 
 function regexIndexOf (inputString: string, regex: RegExp, startpos: number = 0) {
     const indexOf = inputString.substring(startpos).search(regex)
@@ -132,7 +132,7 @@ export function compileFileOrFiles(filename: string, isDirectory: boolean, opts:
             let errors = (result.errors || error).filter((e) => e.type === 'Error' || e.severity === 'error')
             if (errors.length > 0) {
                 if (!isBrowser) require('signale').fatal(errors)
-                return cb(errors)
+                return cb(new CompilationErrors(errors))
             }
             cb(err, result.contracts, result.sources) //return callback with contract details & ASTs
         })
@@ -191,7 +191,7 @@ export function compileContractSources(sources: SrcIfc, compilerConfig: Compiler
         let errors = (result.errors || error).filter((e) => e.type === 'Error' || e.severity === 'error')
         if (errors.length > 0) {
             if (!isBrowser) require('signale').fatal(errors)
-            return cb(errors)
+            return cb(new CompilationErrors(errors))
         }
         cb(err, result.contracts, result.sources) // return callback with contract details & ASTs
     })

remix-tests/src/types.ts

@@ -51,6 +51,21 @@ export interface CompilerConfiguration {
   usingWorker: boolean
 }
 
+export interface CompilationErrors {
+  name: string,
+  errors: Array<Error>,
+  message: string
+}
+
+export class CompilationErrors extends Error {
+  constructor(errors) {
+    const mapError = errors.map((e) => { return e.formattedMessage || e.message })
+    super(mapError.join('\n'))
+    this.errors = errors
+    this.name = 'CompilationErrors'
+  }
+}
+
 /** sources object with name of the file and content **/
 
 ////////////