(deps): upgrade several deps' majors; require Node 10+

- officially drop support for Node <10 since many deps don't support
  it anymore
  - it has been EoL since Dec 31, 2019 and many deps are using newer,
    ES2017 language features now too
  - previously we deprecated it and semi-officially dropped, this time
    is fully official with engines requirement
    - and makes `--target node` target Node v10 instead of v8
    - and will be released as a breaking change

- camelcase, chalk, execa, and fs-extra all dropped Node <10
  - so did prettier v2 and rollup v2 which we will update to in the
    near future

- ora and rollup-plugin-sourcemaps dropped Node <8 in breaking bumps
  - so could've upgraded before, but for some reason some past
    Greenkeeper PRs were closed
    - and pascal-case upgrade didn't change any Node version support
  - Jest 25, which we will update to in the same breaking release, also
    dropped support for Node <8

- rollup-plugin-sourcemaps v0.5 is now written in TS and ships its own
  types, so no need for its @types/ counterpart anymore

- pascal-case changed to use named export instead of a default export

package.json

@@ -34,6 +34,9 @@
     "dist",
     "templates"
   ],
+  "engines": {
+    "node": ">=10"
+  },
   "dependencies": {
     "@babel/core": "^7.4.4",
     "@babel/helper-module-imports": "^7.0.0",
@@ -62,8 +65,8 @@
     "babel-plugin-transform-rename-import": "^2.3.0",
     "babel-traverse": "^6.26.0",
     "babylon": "^6.18.0",
-    "camelcase": "^5.2.0",
-    "chalk": "^2.4.2",
+    "camelcase": "^6.0.0",
+    "chalk": "^4.0.0",
     "enquirer": "^2.3.4",
     "eslint": "^6.1.0",
     "eslint-config-prettier": "^6.0.0",
@@ -74,19 +77,19 @@
     "eslint-plugin-prettier": "^3.1.0",
     "eslint-plugin-react": "^7.14.3",
     "eslint-plugin-react-hooks": "^2.2.0",
-    "execa": "3.2.0",
-    "fs-extra": "^8.0.1",
+    "execa": "4.0.0",
+    "fs-extra": "^9.0.0",
     "jest": "^24.8.0",
     "jest-watch-typeahead": "^0.4.0",
     "jpjs": "^1.2.1",
     "lodash.merge": "^4.6.2",
-    "ora": "^3.4.0",
-    "pascal-case": "^2.0.1",
+    "ora": "^4.0.3",
+    "pascal-case": "^3.1.1",
     "prettier": "^1.19.1",
     "progress-estimator": "^0.2.2",
     "rollup": "^1.32.1",
     "rollup-plugin-babel": "^4.3.2",
-    "rollup-plugin-sourcemaps": "^0.4.2",
+    "rollup-plugin-sourcemaps": "^0.5.0",
     "rollup-plugin-terser": "^5.1.2",
     "rollup-plugin-typescript2": "^0.26.0",
     "sade": "^1.4.2",
@@ -103,7 +106,6 @@
     "@types/node": "^13.1.0",
     "@types/react": "^16.9.11",
     "@types/rollup-plugin-json": "^3.0.2",
-    "@types/rollup-plugin-sourcemaps": "^0.4.2",
     "@types/sade": "^1.6.0",
     "@types/semver": "^7.1.0",
     "@types/shelljs": "^0.8.5",

src/createRollupConfig.ts

@@ -184,7 +184,7 @@ export async function createRollupConfig(
         extensions: [...DEFAULT_EXTENSIONS, 'ts', 'tsx'],
         passPerPreset: true,
         custom: {
-          targets: opts.target === 'node' ? { node: '8' } : undefined,
+          targets: opts.target === 'node' ? { node: '10' } : undefined,
           extractErrors: opts.extractErrors,
           format: opts.format,
         },

src/errors/extractErrors.ts

@@ -11,7 +11,7 @@ import { invertObject } from './invertObject';
 import { evalToString } from './evalToString';
 import { paths } from '../constants';
 import { safeVariableName } from '../utils';
-import pascalCase from 'pascal-case';
+import { pascalCase } from 'pascal-case';
 
 const babylonOptions = {
   sourceType: 'module',