Built-in types

Each field in a message schema has a type. This type can be another message schema, an enum, or one of the primitive types documented below:

boolean

Either true or false.

bytes

Raw binary data, represented as a Uint8Array in JavaScript.

enum

Number that serves as a key in a set of named constants.

float64

64-bit floating-point number.

string

String value encoded as UTF-8.

time

field	type	required	description
sec	uint32	✓	Seconds since epoch
nsec	uint32	✓	Additional nanoseconds since epoch

duration

field	type	required	description
sec	int32	✓	Seconds offset
nsec	uint32	✓	Nanoseconds offset in the positive direction

uint32

Non-negative integer value between 0 and 2³²−1.

int32

Integer value between −2³¹ and 2³¹−1.