build: remove lerna

rollup.config.js

@@ -3,12 +3,12 @@ import path from 'path'
 import ts from 'rollup-plugin-typescript2'
 import replace from '@rollup/plugin-replace'
 import json from '@rollup/plugin-json'
-import lernaJson from './lerna.json'
 
 if (!process.env.TARGET) {
   throw new Error('TARGET package must be specified via --environment flag.')
 }
 
+const masterVersion = require('./package.json').version
 const packagesDir = path.resolve(__dirname, 'packages')
 const packageDir = path.resolve(packagesDir, process.env.TARGET)
 const name = path.basename(packageDir)
@@ -137,7 +137,7 @@ function createReplacePlugin(
 ) {
   return replace({
     __COMMIT__: `"${process.env.COMMIT}"`,
-    __VERSION__: `"${lernaJson.version}"`,
+    __VERSION__: `"${masterVersion}"`,
     __DEV__: isBundlerESMBuild
       ? // preserve to be handled by bundlers
         `(process.env.NODE_ENV !== 'production')`