node.js - How add keyword Nullable (or allowNull) into Ajv? -


i wrote following code. 

var ajv = new require('ajv');  ajv.addkeyword('allownull', {     type: 'null',     metaschema: {         type: 'boolean'     },     compile: function(allownullenable, parentschema) {         return function(data, datapath, parentdata) {             if (allownullenable) {                 return true;             } else {                 if (parentschema.type == 'null') {                     return true;                 } else {                     return data === null ? false : true;                 }             }         }     } });  var schema = {   type: "object",   properties: {     file: {       type: "string",       allownull: true     }   } };  var data = {    file: null };  console.log(ajv.validate(schema, data)) // expected true

but not work. how write such validator?

even if compile function returns true, still not pass validation.

the code can tested in node-sandbox: https://runkit.com/khusamov/59965aea14454f0012d7fec0

you cannot override type keyword. null separate data type in json, need use "type": ["string", "null"] in schema, there no need use custom keyword.


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