Base support for using Typescript within the project

Configuration reference for tsconfig can be located here:
https://www.typescriptlang.org/tsconfig

* Exclude the build output from source control by adding dist to .gitignore
* Rename all project files from .js to .ts
* Upgrade require to import and upgrade module.exports to export default
* Refactored package.json to reference dist folder

When building from typescript, the +x permission is missing, which is
required to execute directly. The command line tool general usage and
testing require it. The post build step adds this.

Author: stephen-slm

.eslintrc.js

@@ -7,6 +7,10 @@ module.exports = {
   extends: [
     'standard'
   ],
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint'
+  ],
   parserOptions: {
     ecmaVersion: 12,
     sourceType: 'module'

.gitignore

@@ -39,3 +39,7 @@ bin
 out
 *.bin
 *.abi
+
+dist/**
+
+.nyc_output

.nycrc

@@ -0,0 +1,17 @@
+{
+    "exclude": [
+        "coverage",
+        "dist/soljson.js",
+        "**/test/**"
+    ],
+    "extensions": [
+        ".js"
+    ],
+    "report-dir": "./coverage",
+    "reporter": [
+        "lcov",
+        "html",
+        "text-summary"
+    ],
+    "temp-directory": "./coverage/.nyc_output"
+}

abi.js renamed to abi.ts

@@ -1,4 +1,4 @@
-const semver = require('semver');
+import * as semver from 'semver';
 
 function update (compilerVersion, abi) {
   let hasConstructor = false;
@@ -58,6 +58,6 @@ function update (compilerVersion, abi) {
   return abi;
 }
 
-module.exports = {
-  update: update
+export default {
+  update
 };

build/clean.js

@@ -0,0 +1,8 @@
+const fs = require('fs');
+const path = require('path');
+
+const distFolder = path.join(__dirname, 'dist');
+
+if (fs.existsSync(distFolder)) {
+  fs.rmdirSync(distFolder);
+}

build/postbuild.js

@@ -0,0 +1,4 @@
+const fs = require('fs');
+const path = require('path');
+
+fs.chmodSync(path.join(__dirname, '../dist', 'solc.js'), '755');

downloadCurrentVersion.js renamed to downloadCurrentVersion.ts

@@ -3,11 +3,11 @@
 // This is used to download the correct binary version
 // as part of the prepublish step.
 
-const pkg = require('./package.json');
-const fs = require('fs');
-const https = require('follow-redirects').https;
-const MemoryStream = require('memorystream');
-const keccak256 = require('js-sha3').keccak256;
+import * as pkg from './package.json';
+import * as fs from 'fs';
+import { https } from 'follow-redirects';
+import * as MemoryStream from 'memorystream';
+import { keccak256 } from 'js-sha3';
 
 function getVersionList (cb) {
   console.log('Retrieving available version list...');

index.js

@@ -0,0 +1,5 @@
+import wrapper from './wrapper';
+
+const soljson = require('./soljson.js');
+
+export default wrapper(soljson);

index.ts

@@ -1,5 +1,5 @@
-const assert = require('assert');
-const keccak256 = require('js-sha3').keccak256;
+import * as assert from 'assert';
+import { keccak256 } from 'js-sha3';
 
 function libraryHashPlaceholder (input) {
   return '$' + keccak256(input).slice(0, 34) + '$';
@@ -88,7 +88,7 @@ const findLinkReferences = function (bytecode) {
   return linkReferences;
 };
 
-module.exports = {
-  linkBytecode: linkBytecode,
-  findLinkReferences: findLinkReferences
+export default {
+  linkBytecode,
+  findLinkReferences
 };