fix javascript component and code

Author: rcannood

src/main/resources/io/viash/languages/javascript/ViashParseJson.js

@@ -1,4 +1,4 @@
-const fs = require('fs');
+const _viashFs = require('fs');
 
 /**
  * Parse JSON parameters file into a JavaScript object.
@@ -14,12 +14,12 @@ function viashParseJson(jsonPath = null) {
     }
   }
 
-  if (!fs.existsSync(jsonPath)) {
+  if (!_viashFs.existsSync(jsonPath)) {
     throw new Error(`Parameters file not found: ${jsonPath}`);
   }
 
   try {
-    const jsonText = fs.readFileSync(jsonPath, 'utf8');
+    const jsonText = _viashFs.readFileSync(jsonPath, 'utf8');
     return JSON.parse(jsonText);
   } catch (error) {
     throw new Error(`Error parsing JSON file: ${error.message}`);

src/test/resources/test_languages/js/code.js

@@ -21,40 +21,36 @@ let meta = {
 const fs = require('fs')
 
 let logFun;
-if (typeof par['log'] === 'undefined') {
+if (!par['log']) {
 	logFun = function(out) {
-	    console.log("INFO:" + out);
+	  console.log("INFO:" + out);
 	}
 } else {
 	logFun = function(out) {
-		fs.appendFile(par['log'], "INFO:" + out + "\n", function (err) {
-			if (err) throw err;
-		});
+		fs.appendFileSync(par['log'], "INFO:" + out + "\n");
 	}
 }
 let outFun;
-if (typeof par['output'] === 'undefined') {
+if (!par['output']) {
 	outFun = console.log
 } else {
 	outFun = function(out) {
-		fs.appendFile(par['output'], out + "\n", function (err) {
-			if (err) throw err;
-		});
+		fs.appendFileSync(par['output'], out + "\n");
 	}
 }
 
 // process parameters
 logFun('Parsed input arguments.')
 
-if (typeof par['output'] === 'undefined') { 
+if (!par['output']) { 
 	logFun('Printing output to console')
 } else {
 	logFun('Writing output to file')
 }
 
 for (const key in par) {
 	if (Array.isArray(par[key]) && par[key].length == 0)
-		outFun(`${key}: |empty array|`)
+		outFun(`${key}: ||`)
 	else if (Array.isArray(par[key]))
 		outFun(`${key}: |${par[key].join(';')}|`)
 	else if (par[key] == undefined)
@@ -63,12 +59,10 @@ for (const key in par) {
 		outFun(`${key}: |${par[key]}|`)
 }
 
-fs.readFile(par['input'], 'utf8', function(err, data){
-    outFun(`head of input: |${data.split('\n')[0]}|`)
-})
-fs.readFile(meta['resources_dir'] + '/resource1.txt', 'utf8', function(err, data){
-    outFun(`head of resource1: |${data.split('\n')[0]}|`)
-})
+let inputData = fs.readFileSync(par['input'], 'utf8');
+outFun(`head of input: |${inputData.split('\n')[0]}|`)
+let resourceData = fs.readFileSync(meta['resources_dir'] + '/resource1.txt', 'utf8');
+outFun(`head of resource1: |${resourceData.split('\n')[0]}|`)
 
 for (const key in meta) {
 	if (meta[key] == undefined || String(meta[key]) == 'NaN')