Passives

The common parts — resistors, capacitors, LEDs, diodes, inductors, fuses — are built into @typecad/pcb. There's no second package to install: import them from the package root and pick the physical size with the size option.

classes

Resistor / LED / Capacitor / Diode / Inductor / Fuse

import { Resistor } from '@typecad/pcb'

Pre-built Component subclasses for the common passives. The size option selects the KiCAD symbol and footprint preset; an explicit footprint or symbol always wins over it.

Example first

passives.ts

import { PCB, Resistor, LED } from '@typecad/pcb';

let typecad = new PCB('typecad_docs');

let r1 = new Resistor({ value: '1kohm', size: '0805' });
let d1 = new LED({ value: 'green' });        // size defaults to '0603'

Sizes

size	Notes
'1210'	all component types
'1206'	all component types
'0805'	all component types
'0603'	all component types — the default
'0402'	no fuses
'0201'	no fuses

Multiple sizes in one file

There are no size modules to import — pass a different size per part:

mixed-sizes.ts

let r1 = new Resistor({ value: '1kohm', size: '0603' });
let c2 = new Capacitor({ value: '1uF', size: '0805' });

Reference designators

Case	Behavior
reference passed	Used as-is; a name conflict is renamed with a warning in the build output
reference omitted	Generated from the prefix property and an internal counter by type — R1, R2, C1...
prefix omitted	Type defaults: R for resistors, C for capacitors, D for LEDs, etc.

Unique footprints

For a passive with a footprint outside the presets, pass it directly — an explicit footprint overrides the size preset:

unique.ts

let l1 = new Inductor({
  value: '1uH',
  footprint: 'Inductor_SMD:L_0805_2012Metric_Custom'
});

function

passiveFactory

import { passiveFactory } from '@typecad/pcb'

Builds a set of passive classes bound to one default size — the shape packages receive as this.passives. Handy on its own when a design mixes sizes heavily.

Example first

factory.ts

import { passiveFactory } from '@typecad/pcb';

const passives = passiveFactory('0805');   // everything defaults to 0805
let r1 = new passives.Resistor({ value: '10kohm' });
let c1 = new passives.Capacitor({ value: '100nF', size: '0402' });  // per-part size wins

The bound size is a default: an explicit size on an individual part still wins. See Packages for how package authors receive one of these automatically.

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