Read version from package.json

Author: roryabraham

.github/actions/javascript/getPreviousVersion/action.yml

@@ -1,9 +1,6 @@
 name: 'Get previous npm version'
 description: 'Get the previous app version.'
 inputs:
-  CURRENT_VERSION:
-    description: The current app version
-    required: true
   SEMVER_LEVEL:
     description: Semantic Versioning Level
     required: true

.github/actions/javascript/getPreviousVersion/getPreviousVersion.js

@@ -1,18 +1,14 @@
+const {readFileSync} = require('fs');
 const core = require('@actions/core');
 const _ = require('underscore');
-const semverValid = require('semver/functions/valid');
 const versionUpdater = require('../../../libs/versionUpdater');
 
-const currentVersion = core.getInput('CURRENT_VERSION', {require: true});
-if (!semverValid(currentVersion)) {
-    core.setFailed(`Error: CURRENT_VERSION ${currentVersion} is not a valid semver version`);
-}
-
 let semverLevel = core.getInput('SEMVER_LEVEL', {require: true});
 if (!semverLevel || !_.contains(versionUpdater.SEMANTIC_VERSION_LEVELS, semverLevel)) {
     semverLevel = versionUpdater.SEMANTIC_VERSION_LEVELS.PATCH;
     console.warn(`Invalid input for 'SEMVER_LEVEL': ${semverLevel}`, `Defaulting to: ${semverLevel}`);
 }
 
+const {version: currentVersion} = JSON.parse(readFileSync('./package.json'));
 const previousVersion = versionUpdater.getPreviousVersion(currentVersion, semverLevel);
 core.setOutput('PREVIOUS_VERSION', previousVersion);