feat(usage): add YARGS_DISABLE_WRAP env variable to disable wrap (#2210)

Author: jgoux

lib/usage.ts

@@ -163,14 +163,17 @@ export function usage(yargs: YargsInstance, shim: PlatformShim) {
     wrap = cols;
   };
 
-  function getWrap() {
+  self.getWrap = () => {
+    if (shim.getEnv('YARGS_DISABLE_WRAP')) {
+      return null;
+    }
     if (!wrapSet) {
       wrap = windowWidth();
       wrapSet = true;
     }
 
     return wrap;
-  }
+  };
 
   const deferY18nLookupPrefix = '__yargsString__:';
   self.deferY18nLookup = str => deferY18nLookupPrefix + str;
@@ -202,7 +205,7 @@ export function usage(yargs: YargsInstance, shim: PlatformShim) {
       }, {} as Dictionary<boolean>)
     );
 
-    const theWrap = getWrap();
+    const theWrap = self.getWrap();
     const ui = shim.cliui({
       width: theWrap,
       wrap: !!theWrap,
@@ -769,6 +772,7 @@ export interface UsageInstance {
   getPositionalGroupName(): string;
   getUsage(): [string, string][];
   getUsageDisabled(): boolean;
+  getWrap(): number | nil;
   help(): string;
   reset(localLookup: Dictionary<boolean>): UsageInstance;
   showHelp(level?: 'error' | 'log' | ((message: string) => void)): void;

test/usage.cjs

@@ -1912,7 +1912,16 @@ describe('usage tests', () => {
 
       // the long description should cause several line
       // breaks when wrapped.
-      r.errors[0].split('\n').length.should.gte(4);
+      r.errors[0].split('\n').length.should.gte(5);
+    });
+
+    it('should not wrap when YARGS_DISABLED_WRAP is provided', () => {
+      const yargsInstance = yargs().wrap(99);
+      process.env.YARGS_DISABLE_WRAP = 'true';
+      expect(
+        yargsInstance.getInternalMethods().getUsageInstance().getWrap()
+      ).to.equal(null);
+      delete process.env.YARGS_DISABLE_WRAP;
     });
 
     it('should not raise an exception when long default and description are provided', () =>