Issue type:

[ ] question
[x ] bug report
[ ] feature request
[ ] documentation issue

Database system/driver:

[ ] cordova
[ ] mongodb
[ ] mssql
[ ] mysql / mariadb
[ ] oracle
[x ] postgres
[ ] cockroachdb
[ ] sqlite
[ ] sqljs
[ ] react-native
[ ] expo

TypeORM version:

[x ] latest
[ ] @next
[ ] 0.x.x (or put your version here)

Steps to reproduce or a small repository showing the problem:
https://github.com/joalorro/typeorm-cli-bug

I'm currently attempting to have a Node file programmatically generate migrations via the TypeORM CLI, but I get the error "TypeError: str.replace is not a function". When running the same command via NPM, the migration is successfully created.

I console.log'd the variable "args" within MigrationGenerateCommand.js on line 92 (below "case 8:") and found that it looks like:

{
  _: [ 'migration:generate', 'initial' ], // extra element
  config: 'ormconfig.json',
  f: 'ormconfig.json',
  n: true, // bolean
  name: true, //boolean
  c: 'default',
  connection: 'default',
  '$0': 'node_modules/typeorm/cli.js'
 }

when it should look like:

{
  _: [ 'migration:generate' ],
  config: 'ormconfig.json',
  f: 'ormconfig.json',
  n: 'initial', //string
  name: 'initial', //string
  c: 'default',
  connection: 'default',
  '$0': 'node_modules/typeorm/cli.js'
 }

The latter object is produced when running the package.json scripts, and String.replace is attempting to run on args.name, which is now a boolean.

Node command: node migration.js initial
NPM command: npm run typeorm:migrate initial

// package.json
{
  ...,
  scripts: {
  ...,
    "typeorm": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli.js --config ormconfig.json",
    "typeorm:migrate": "npm run typeorm migration:generate -- -n",
  }
}