OfficeExtension

ClientObject

An abstract object representing the active Office document

context		the request context associated with the object.
isNullObject		you must call context.sync before checking this property.

ClientRequestContext

An abstract object that facilitates requests to the host Office application.
The Excel.run method provides a request context.

debugInfo	P
requestHeaders	P
trackedObjects	P
load	M
loadRecursive	M
sync	M
trace	M

ClientResult

Contains the result for methods that return primitive types.
The objects value property is retrieved from the document after context.sync is involved.

value	P

DebugInfo

Provides useful information about an error.

code	P	(string)
errorLocation	P	(string)
fullStatements	P	(string[])
innerError	P
message	P	(string)
statements	P	(string)
surroundingStatements	P	(string)

EmbeddedOptions

An interface with these properties

container	P	(HTMLElement)
height	P	(string)
id	P	(string)
sessionKey	P	(string)
timeoutInMilliseconds	P	(string)
width	P	(string)

EmbeddedSession

An abstract class

init	M	(HTMLElement)

Error

The error object that is returned by "context.sync()" when a promise is rejected while processing the request.

code	P	(string) short name of the error
debugInfo	P	(OfficeExtension.DebugInfo) more useful information
innerError	P	(Error) inner message, if applicable
message	P	(string) description of the error
name	P	(string) always OfficeExtension.Error
stack	P	(string) stack trace, if applicable
traceMessage	P	(string[]) trace messages added via context.trace()

ErrorCodes

An abstract class

accessDenied	P	(string)
activityLimitReached	P	(string)
apiNotFound	P	(string)
cannotRegisterEvent	P	(string)
connectionFailure	P	(string)
generalException	P	(string)
invalidArgument	P	(string)
invalidObjectPath	P	(string)
invalidRequestContext	P	(string)
propertyNotLoaded	P	(string)
runMustReturnPromise	P	(string)
valueNotLoaded	P	(string)

EventHandlerResult

context	P
remove	M

EventHandlers

add	M
remove	M

EventInfo

An interface with these properties

eventArgsTransformFunc	P
registerFunc	P
unregisterFunc	P

LoadOption

Specifies which properties of an object should be loaded.
This load happens when the sync method is executed.

context.load(paragraphs, 'text,font/size');  
paragraphs.load('text,font/size');  
paragraphs.load( { select: 'text,font/size' , expand:'font' , top:50 , skip:50 });

expand	P
select	P
skip	P
top	P

Promise

Available in ExcelApi 1.2 or WordApi 1.2 or higher.. The examples below will use OfficeExtension.Promise, as it's the easiest way to get started.
You can use OfficeExtension.Promise in place of the global Promise object. because Office.js includes its own Promise poly-filla.
(page 74)

RequestContextDebugInfo

Contains debug information about the request context

pendingStatements	P

RequestUrlAndHeaderInfo

An interface to specify the request URL and headers.

headers	P
url	P

RunOptions

Additional options that can be passed to the HOST.run() method.

previousObjects	P
session	P

TrackedObjects

Collection of tracked objects contained within a request.

add	M
remove	M

UpdateOptions

Provides an option for supressing an error when the object that is used to set multiple properties tries to set read-only properties.

throwOnReadOnly	P