const P = require("parsimmon");
const ab = P.alt(P.seq(P.string("a").sepBy1(P.string("+"))), P.all);
const input = "a+a-a";
Normal parser usage
ab.parse(input)
This calls the private parser implementation directly in order to bypass the EOF logic
ab._(input, 0)
This roughly emulates the behavior of `.parse`
ab.skip(P.eof)._(input, 0)
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