removed NodeJS dependency from common.js

src/common.js

@@ -1,5 +1,3 @@
-import * as fs from "node:fs";
-
 export function mixin(child, ...parents) {
     // child is modified directly, assigning fields from parents that are missing in child.  parents fields are
     // assigned by parents order, highest priority first
@@ -98,18 +96,6 @@ export class AsyncURLCache extends AsyncAbiCache {
 }
 
 
-export class AsyncFileCache extends AsyncAbiCache {
-    constructor(pathForKey) {
-        super(async (key) => {
-            const path = this.pathForKey(key)
-            const data = fs.readFileSync(path, 'utf8');
-            return JSON.parse(data);
-        })
-        this.pathForKey = pathForKey
-    }
-}
-
-
 export class AbiURLCache extends AsyncURLCache {
     constructor(baseUrl) {
         super((name)=>{
@@ -120,16 +106,6 @@ export class AbiURLCache extends AsyncURLCache {
 }
 
 
-export class AbiFileCache extends AsyncFileCache {
-    constructor(basePath) {
-        super((name)=>{
-            return this.basePath+abiPath(name)
-        })
-        this.basePath = basePath.endsWith('/') ? basePath : basePath + '/'
-    }
-}
-
-
 const files = {
     // If a contract is in a file different than its name, put the exception here
     // 'IVaultLogic' : 'IVault', // for example