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Append, prepend, and insert zero-width space to string.

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const assert = require( "assert" ); const fnamed = require( "./fnamed.js" ); assert.equal( fnamed( function test( ){ } ), true, "should return true" ); assert.equal( fnamed( Error ), true, "should return true" ); assert.equal( fnamed( function( ){ } ), false, "should return false" ); assert.equal( fnamed( ( ) => { } ), false, "should return false" ); assert.equal( fnamed( ( entity ) => ( typeof entity == "string" ) ), false, "should return false" ); assert.equal( fnamed( "function hello( ){ }" ), false, "should return false" ); console.log( "ok" );