'Injecting WHERE clause into pgpromise pg SELECT query

I'd like to be able to reuse a SELECT query by injecting a conditional WHERE clause. See example below.

let where = null;
if(condition) where = `WHERE patient.mongodb_id = $2`;

const patient = await db
.oneOrNone(
  `SELECT * FROM patients
   $1:value;`,
  [where, mongodbId]

I'm aware that the code above is wrong as it throws the following error: error: there is no parameter $2. I've read through the docs and I don't seem to be able to find a good example on how to do this.

javascriptpostgresqlpg-promise


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