Add support for v8-canary, nightly and rc (#655)

src/distributions/base-distribution-prerelease.ts

@@ -0,0 +1,53 @@
+import * as tc from '@actions/tool-cache';
+
+import semver from 'semver';
+
+import BaseDistribution from './base-distribution';
+import {NodeInputs} from './base-models';
+
+export default abstract class BasePrereleaseNodejs extends BaseDistribution {
+  protected abstract distribution: string;
+  constructor(nodeInfo: NodeInputs) {
+    super(nodeInfo);
+  }
+
+  protected findVersionInHostedToolCacheDirectory(): string {
+    let toolPath = '';
+    const localVersionPaths = tc
+      .findAllVersions('node', this.nodeInfo.arch)
+      .filter(i => {
+        const prerelease = semver.prerelease(i);
+        if (!prerelease) {
+          return false;
+        }
+
+        return prerelease[0].includes(this.distribution);
+      });
+    localVersionPaths.sort(semver.rcompare);
+    const localVersion = this.evaluateVersions(localVersionPaths);
+    if (localVersion) {
+      toolPath = tc.find('node', localVersion, this.nodeInfo.arch);
+    }
+
+    return toolPath;
+  }
+
+  protected validRange(versionSpec: string) {
+    let range: string;
+    const [raw, prerelease] = this.splitVersionSpec(versionSpec);
+    const isValidVersion = semver.valid(raw);
+    const rawVersion = (isValidVersion ? raw : semver.coerce(raw))!;
+
+    if (prerelease !== this.distribution) {
+      range = versionSpec;
+    } else {
+      range = `${semver.validRange(`^${rawVersion}-${this.distribution}`)}-0`;
+    }
+
+    return {range, options: {includePrerelease: !isValidVersion}};
+  }
+
+  protected splitVersionSpec(versionSpec: string) {
+    return versionSpec.split(/-(.*)/s);
+  }
+}